Cited by 0Supply Chain Resilience and Risk ManagementTopic ModelingSemantic Web and Ontologies

Knowledge Graph-Enhanced LLMs for Supply Chain Intelligence: Automating Network Visibility Through Public Data Mining

Open access
Duttyal, Shikha·2025·Technix International Journal for Engineering Research

Abstract

Knowledge Graph integration with Large Language Models presents a novel framework for automated supply chain intelligence through public data mining. This innovation overcomes traditional visibility limitations by leveraging unstructured information sources rather than relying exclusively on stakeholder data sharing. Advanced LLMs systematically extract supply chain entities and relationships from news reports, regulatory filings, and trade databases, organizing these facts into semantically rich Knowledge Graphs that provide comprehensive, machine-readable network representations. The resulting system enables dynamic, real-time mapping of complex global supply chains, supporting enhanced risk monitoring, resilience planning, and regulatory compliance efforts. Case examples across multiple industries illustrate practical applications, while evaluation metrics confirm improved accuracy over existing methods. Ethical and practical challenges remain alongside promising directions for improving extraction reliability and model performance, offering a scalable solution to persistent supply network opacity without requiring direct data input from involved companies.

AI snapshot

Written from the paper’s full text.

TL;DR

The paper proposes integrating Knowledge Graphs with Large Language Models to automate supply chain mapping from public data sources, reducing reliance on stakeholder data sharing. It describes a methodology, cross-industry case examples, and challenges, but reports no original quantitative evaluation.

Key findings

  • The framework uses LLMs to extract supply chain entities and relationships from news reports, regulatory filings, social media, and trade databases, then organizes them into Knowledge Graphs for multi-tier network visibility, risk monitoring, resilience planning, and regulatory compliance.
  • A comparative table states traditional mapping is limited beyond tier-one suppliers and takes months to establish a baseline, while the LLM–Knowledge Graph approach can achieve multi-tier visibility, weeks with continuous updates, and continuous automated updates, though relationship confidence is variable and requires confidence scoring.
  • Case examples cover semiconductor shortage analysis, automotive parts suppliers, pharmaceutical active ingredient sources, consumer goods sourcing, and forced labor tracing; these illustrate applications but do not report specific accuracy figures.
  • The paper identifies hallucination, data availability and quality, scalability and computational cost, and ethical/legal concerns as major challenges.

Methods

  • Conceptual/theoretical framework and methodology for automated supply chain mapping using public data sources, LLM-powered entity and relationship extraction, Knowledge Graph construction and enrichment, verification and confidence scoring, and temporal updating.
  • Illustrative case studies across semiconductor, automotive, pharmaceutical, consumer goods, and regulatory compliance, drawing on cited external sources rather than describing a primary dataset or experiment.
  • Main analysis is qualitative synthesis and comparative discussion; no quantitative experimental design, sample size, or statistical analysis is reported.

Limitations

  • Stated: data availability and quality vary by industry, region, and company type; hallucination risk remains; scalability and computational requirements are significant; ethical and legal data-governance issues exist; ground truth for accuracy evaluation is scarce.
  • Stated: complete elimination of hallucination remains an open challenge, necessitating human oversight for critical applications.
  • Evident: no original empirical validation, quantitative accuracy metrics, or reproducible implementation details are provided; case examples rely on cited external reports, and some tables in the provided text are incomplete or garbled.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.56975/tijer.v12i6.158410

Cites

8 of 8 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Claims the paper makes

0 of 38 cited sources checked · 0 supported · 0 flagged

  • Premisecitation

    Companies continue to struggle with obtaining comprehensive visibility across multi-tier supply chains.

    “Despite technological advancements, companies continue to struggle with obtaining comprehensive visibility across multi-tier supply chains [1].”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [1]

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Premisecitation

    The time required to construct initial supply chain maps decreases from months to weeks.

    “The time required to construct initial supply chain maps decreases from months to weeks, with continuous updates maintaining accuracy over time.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [7]

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Premisecitation

    For pharmaceuticals, automated mapping identifies active pharmaceutical ingredient sources and manufacturing relationships that impact drug availability and quality.

    “For pharmaceuticals, automated mapping identifies active pharmaceutical ingredient sources and manufacturing relationships that impact drug availability and quality [8].”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [8]

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Premisecitation

    LLMs' tendency to hallucinate presents a serious challenge for supply chain mapping where accuracy is paramount.

    “LLMs' tendency to occasionally generate plausible-sounding but factually incorrect information-commonly referred to as hallucination-presents a serious challenge for supply chain mapping applications where accuracy is paramount [10].”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [10]

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Interpretationcitation

    Applying the LLM and KG methodology to semiconductor supply chains reveals multi-tier dependencies that remain obscured in traditional mapping approaches.

    “Applying the LLM and knowledge graph methodology to semiconductor supply chains reveals multi-tier dependencies that remain obscured in traditional mapping approaches.”
    Quote in the paperSubstantial claim
  • Classified as probably not a substantial claim. 25
  • May combine two claims. 11
  • Classified as probably not a substantial claim.

    Premisecitation

    Supply chain visibility remains a persistent challenge for modern organizations seeking to monitor, manage, and optimize their complex networks of suppliers, manufacturers, distributors, and retailers.

    “Supply chain visibility remains a persistent challenge for modern organizations seeking to monitor, manage, and optimize their complex networks of suppliers, manufacturers, distributors, and retailers.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [1]

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Probably not a substantial claim: may not pass S4 (based).

    Interpretationreasoning

    The underlying knowledge graph structure facilitates impact propagation analysis, tracing how disruptions might cascade through multiple tiers.

    “The underlying knowledge graph structure facilitates impact propagation analysis, tracing how disruptions might cascade through multiple supply chain tiers.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Greenfield et al. examine how this approach supports compliance with forced labor regulations by tracing products back to their sources.

    “Greenfield et al. examine how this approach supports compliance with forced labor regulations by tracing products back to their sources [8].”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [8]

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Premisecitation

    Traditional approaches typically achieve limited visibility beyond tier-one suppliers, while automated approach can discover relationships across multiple tiers.

    “Traditional approaches relying on supplier surveys and manual data collection typically achieve limited visibility beyond tier-one suppliers, while the automated approach can discover relationships across multiple tiers [7].”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [7]

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Probably not a substantial claim: may not pass S2 (checkable), S4 (based).

    Interpretationreasoning

    An emerging paradigm seeks to overcome these limitations through public data-driven supply chain intelligence.

    “An emerging paradigm seeks to overcome these limitations through public data-driven supply chain intelligence.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S2 (checkable).

    Interpretationreasoning

    The knowledge graph must incorporate temporal annotations that indicate when relationships were established, modified, or terminated.

    “The knowledge graph must incorporate temporal annotations that indicate when relationships were established, modified, or terminated.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Premisecitation

    These barriers result in fragmented visibility, particularly beyond immediate tier-one suppliers, leaving organizations vulnerable to hidden risks and disruptions.

    “These barriers result in fragmented visibility, particularly beyond immediate tier-one suppliers, leaving organizations vulnerable to hidden risks and disruptions [2].”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [2]

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Thadani and Allen highlight how public data analysis can identify critical chokepoints in the semiconductor value chain.

    “Thadani and Allen highlight how public data analysis can identify critical chokepoints in the semiconductor value chain, from raw materials to finished chips [7].”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [7]

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Recent advancements in model architectures, training, and scaling have significantly improved LLMs' ability to extract meaningful information from diverse text sources.

    “Recent advancements in model architectures, training methodologies, and parameter scaling have significantly improved LLMs' ability to extract meaningful information from diverse text sources [3].”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [3]

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Interpretationcitation

    This bidirectional enhancement creates a virtuous cycle where KGs provide factual constraints for LLMs, while LLMs expand KG coverage.

    “This bidirectional enhancement creates a virtuous cycle where KGs provide factual constraints for LLMs, while LLMs expand KG coverage by discovering new entities and relationships from textual data [3].”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [3]

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Interpretationreasoning

    Comparing the LLM and KG approach with traditional methods reveals significant advantages in coverage, speed, and cost-effectiveness.

    “Comparing the LLM and knowledge graph approach with traditional supply chain mapping methods reveals significant advantages in coverage, speed, and cost-effectiveness.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S2 (checkable).

    Premisecitation

    Traditional precision and recall metrics must be adapted to supply chain context where relationships vary in type, strength, and temporal validity.

    “Traditional precision and recall metrics provide a foundation, but must be adapted to the supply chain context where relationships vary in type, strength, and temporal validity [9].”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [9]

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Graph enrichment processes augment the basic structure with additional attributes that enhance analytical capabilities.

    “Graph enrichment processes augment the basic structure with additional attributes such as geographic coordinates, industry classifications, and company metadata that enhance analytical capabilities [5].”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [5]

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Probably not a substantial claim: may not pass S4 (based).

    Interpretationreasoning

    This approach leverages publicly available information to construct supply chain maps without requiring direct stakeholder participation.

    “This approach leverages the vast amounts of publicly available information-including news reports, regulatory filings, social media, and trade databases-to construct supply chain maps without requiring direct stakeholder participation.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing). May combine two claims.

    Premisecitation

    Public data sources include news articles, corporate press releases, regulatory filings, social media posts, and trade databases.

    “These sources include news articles, corporate press releases, regulatory filings, social media posts, and specialized trade databases [5].”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [5]

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    As knowledge graphs grow, specialized graph database technologies become essential for maintaining query performance.

    “As knowledge graphs grow, specialized graph database technologies become essential for maintaining query performance across complex supply network structures [9].”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [9]

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Interpretationcitation

    Temporal awareness enables historical analysis of supply network evolution while maintaining current views of active relationships.

    “This temporal awareness enables historical analysis of supply network evolution while maintaining current views of active relationships [6].”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [6]

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Probably not a substantial claim: may not pass S4 (based).

    Interpretationreasoning

    By applying LLMs and KGs, organizations can potentially automate the extraction and structuring of supply chain information from public sources.

    “By applying advanced artificial intelligence techniques, specifically the combination of Large Language Models (LLMs) and Knowledge Graphs, organizations can potentially automate the extraction and structuring of supply chain information from these diverse public sources.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing), S4 (based).

    Interpretationnone given

    Systematic aggregation and inference of business relationships may reveal information companies consider sensitive or proprietary.

    “While public data is ostensibly available for analysis, the systematic aggregation and inference of business relationships may reveal information that companies consider sensitive or proprietary.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Li Wei and Ma Yi-zhong propose performance evaluation frameworks that can be adapted to assess extraction accuracy.

    “Li Wei and Ma Yi-zhong propose performance evaluation frameworks that can be adapted to assess extraction accuracy, with particular attention to precision in identifying critical tier-one relationships versus recall in discovering extended network connections [9].”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [9]

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Classified as probably not a substantial claim. May combine two claims.

    Premisecitation

    Verification approaches include cross-source corroboration, temporal consistency checking, and domain knowledge validation.

    “Verification approaches include cross-source corroboration, temporal consistency checking, and domain knowledge validation [6].”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [6]

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • May combine two claims.

    Interpretationreasoning

    While traditional methods may provide higher confidence for directly surveyed relationships, automated approach achieves broader coverage.

    “While traditional methods may provide higher confidence for directly surveyed relationships, the automated approach achieves broader coverage by incorporating relationships that might otherwise remain undiscovered.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S2 (checkable).

    Interpretationreasoning

    Given inherent uncertainty in public data, robust verification mechanisms and confidence scoring are essential.

    “Given the inherent uncertainty in information extracted from public sources, robust verification mechanisms and confidence scoring are essential components of the methodology.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Park et al. emphasize the importance of transparent confidence metrics.

    “Park et al. emphasize the importance of transparent confidence metrics that allow users to understand the evidential basis for each component of the supply chain map [5].”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [5]

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Classified as probably not a substantial claim.

    Premisecitation

    LLMs have demonstrated remarkable capabilities in natural language understanding and generation.

    “Large Language Models have demonstrated remarkable capabilities in natural language understanding and generation, making them powerful tools for processing unstructured text about supply chains.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [3]

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Automated extraction of supply chain information from public sources raises important ethical and legal questions.

    “Automated extraction of supply chain information from public sources raises important ethical and legal questions regarding data usage, privacy, and potential competitive impacts [10].”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites [10]

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Classified as probably not a substantial claim. May combine two claims.

    Premisecitation

    KGs model companies, products, facilities, and locations as nodes, while supplier-customer relationships, material flows, and transportation routes are represented as edges.

    “In the supply chain context, KGs model companies, products, facilities, and locations as nodes, while supplier-customer relationships, material flows, and transportation routes are represented as edges [4].”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites [4]

      Couldn’t be matched to a paper in Crossref, so it can’t be checked.

  • Classified as probably not a substantial claim. May combine two claims.

    Interpretationreasoning

    The resulting knowledge graph provides a unified view of the supply network that can be queried, visualized, and analyzed to derive actionable insights.

    “The resulting knowledge graph provides a unified view of the supply network that can be queried, visualized, and analyzed to derive actionable insights.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S2 (checkable). May combine two claims.

    Premisereasoning

    Important challenges remain in ensuring extraction accuracy, managing computational requirements, addressing ethical considerations, overcoming data limitations, and mitigating hallucination risks.

    “Despite significant progress, important challenges remain in ensuring extraction accuracy, managing computational requirements, addressing ethical considerations, overcoming data limitations, and mitigating hallucination risks.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S2 (checkable).

    Interpretationreasoning

    The integration of KGs and LLMs represents a transformative approach to supply chain mapping that addresses longstanding visibility challenges.

    “The integration of Knowledge Graphs and Large Language Models represents a transformative approach to supply chain mapping that addresses longstanding visibility challenges through automated public data analysis.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S2 (checkable), S3 (load-bearing), S4 (based).

    Interpretationnone given

    Regulatory compliance applications illustrate its value for addressing pressing governance challenges.

    “The case studies across semiconductor, automotive, pharmaceutical, and consumer goods sectors demonstrate practical applicability across diverse industries, while regulatory compliance applications illustrate its value for addressing pressing governance challenges.”
    Quote in the paperNot a substantial claim
31 of 31
  • The paper relies on this without support.

    The conventional methodology for constructing supply chain maps depends almost entirely on voluntary participation and information sharing from all involved parties.

    “The conventional methodology for constructing supply chain maps depends almost entirely on voluntary participation and information sharing from all involved parties.”
  • The paper relies on this without support.

    Supply chains are dynamic systems that evolve over time.

    “Supply chains are not static structures but dynamic systems that evolve over time.”
  • The paper relies on this without support.

    KGs support semantic reasoning through property paths, neighborhood exploration, and graph pattern matching, which help identify indirect dependencies and vulnerability propagation.

    “KGs support semantic reasoning through techniques such as property paths, neighborhood exploration, and graph pattern matching, which help identify indirect dependencies and vulnerability propagation throughout supply networks.”
  • The paper relies on this without support.

    Fine-tuning LLMs with domain-specific training examples enhances their ability to recognize supply chain terminologies and relationship patterns.

    “Fine-tuning LLMs with domain-specific training examples enhances their ability to recognize supply chain terminologies and relationship patterns that might be missed by general-purpose language models.”
  • The paper relies on this without support.

    Real-time monitoring of news feeds and social media provides early signals of potential changes, while periodic scanning of regulatory filings captures more formal relationship changes.

    “Real-time monitoring of news feeds and social media provides early signals of potential changes, while periodic scanning of regulatory filings captures more formal relationship changes.”
  • The paper relies on this without support.

    Ground truth evaluation presents a unique challenge, as complete supply chain maps rarely exist for comparison.

    “Ground truth evaluation presents a unique challenge, as complete supply chain maps rarely exist for comparison.”
  • The paper relies on this without support.

    Knowledge graph construction and querying add additional computational complexity.

    “Knowledge graph construction and querying add additional computational complexity, especially as graphs grow to encompass global supply networks with millions of entities and relationships.”
  • The paper relies on this without support.

    Legal frameworks for data mining vary significantly across jurisdictions, creating compliance challenges.

    “Legal frameworks for data mining vary significantly across jurisdictions, creating compliance challenges for global implementations.”
  • The paper relies on this without support.

    Ethical considerations include potential biases in source selection and processing that might disadvantage certain regions or industries.

    “Ethical considerations include potential biases in source selection and processing that might disadvantage certain regions or industries with less digital visibility.”
  • The paper relies on this without support.

    The effectiveness of public data-driven mapping depends fundamentally on availability and quality of information sources.

    “The effectiveness of public data-driven supply chain mapping depends fundamentally on the availability and quality of relevant information sources.”
  • The paper relies on this without support.

    Data availability varies dramatically across industries, regions, and company types.

    “Data availability varies dramatically across industries, regions, and company types, with public information typically more abundant for large, publicly-traded companies in developed economies.”
  • The paper relies on this without support.

    Data quality issues include reporting lags, inconsistent entity naming, ambiguous relationship descriptions, and factual errors.

    “Data quality issues include reporting lags, inconsistent entity naming, ambiguous relationship descriptions, and factual errors in source materials.”
  • The paper relies on this without support.

    Advanced prompting and retrieval-augmented generation have demonstrated promise in reducing hallucination rates.

    “Advanced prompting techniques and retrieval-augmented generation approaches have demonstrated promise in reducing hallucination rates.”
  • The paper relies on this without support.

    Complete elimination of hallucination risk remains an open challenge.

    “However, complete elimination of hallucination risk remains an open challenge, necessitating human oversight for critical applications.”
  • The paper relies on this without support.

    Evaluation metrics confirm improved accuracy over existing methods.

    “Case examples across multiple industries illustrate practical applications, while evaluation metrics confirm improved accuracy over existing methods.”
15 of 15

Cites

Flagged first, then by citations

Research works printed but not linked: 2

  1. YoungWon Park, et al., "Introduction of Information System and Database Integration Capability in Supply Chain Management," PICMET '09 -2009 Portland International Conference on Management of Engineering & Technology, 25 September 2009. https://ieeexplore.ieee.org/document/5261989
  2. IEEE Digital Privacy "Ethical Issues Related to Data Privacy and Security: Balancing Ethical and Legal Requirements in the Connected World,". https://digitalprivacy.ieee.org/publications/topics/ethical-issues-related-to- data-privacy-and-security-why-we-must-balance-ethical-and-legal-requirements-in-the-connected-world

Authors
Duttyal, S.
Affiliations
Northern Illinois University (US)
Corresponding author
Duttyal, Shikha
Venue
Technix International Journal for Engineering Research
Published
2025
Volume
12
Issue
6
ISSN
2349-9249 (ISSN-L)
OpenAlex
W4411310314
Cited by
0
References
7
FWCI
0.00
Type
journal article
Language
en
Open access
Licence
cc-by-nc
Locations
Technix International Journal for Engineering Research (publishedVersion, cc-by-nc)
Topics
  • Social Sciences › Business, Management and Accounting › Strategy and Management › Supply Chain Resilience and Risk Management
  • Physical Sciences › Computer Science › Artificial Intelligence › Topic Modeling
  • Physical Sciences › Computer Science › Artificial Intelligence › Semantic Web and Ontologies
Keywords
knowledge graphs, large language models, supply chain intelligence, supply chain visibility, entity relation extraction, news articles, regulatory submissions, supply chain resilience, regulatory compliance

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Claims read by deepseek-v4.1-flash under definition version 3 (extract-v3) on 2026-10-21.

Classified by jev-1.13-20260917 (gold-guideline-v0.2) on 2026-10-21.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

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