Crystal structure prediction using ab initio evolutionary techniques: Principles and applications
Open accessAbstract
We have developed an efficient and reliable methodology for crystal structure prediction, merging ab initio total-energy calculations and a specifically devised evolutionary algorithm. This method allows one to predict the most stable crystal structure and a number of low-energy metastable structures for a given compound at any P-T conditions without requiring any experimental input. Extremely high (nearly 100%) success rate has been observed in a few tens of tests done so far, including ionic, covalent, metallic, and molecular structures with up to 40 atoms in the unit cell. We have been able to resolve some important problems in high-pressure crystallography and report a number of new high-pressure crystal structures (stable phases: ε-oxygen, new phase of sulphur, new metastable phases of carbon, sulphur and nitrogen, stable and metastable phases of CaCO3). Physical reasons for the success of this methodology are discussed.
Integrity signals
Registry
Cites
Statistics
Claims the paper makes
Claims other papers make about this one
Each is checked against this paper’s own text: does it say what the citing paper says it does?
The problem of obtaining a complete yet concise description of a molecular or condensed-phase structure is central to many modelling techniques.
“The problem of obtaining a complete yet concise description of a molecular or condensed-phase structure is central to many modelling techniques, including the sampling of rare events 15 and the search for stable structures 2,16,17 .”
From Unsupervised machine learning in atomistic simulations, between predictions and understanding (2019) · cites this paper as [17]
Cites
Generalized Gradient Approximation Made Simple
Perdew, J. P., Burke, K., & Ernzerhof, M. (1996) · Physical Review Letters · doi:10.1103/physrevlett.77.3865 · Cited by 215,824 · see citing works
Kresse, G., & Furthmüller, J. (1996) · Physical Review B · doi:10.1103/physrevb.54.11169 · Cited by 123,652 · see citing works
Density-functional thermochemistry. III. The role of exact exchange
Becke, A. D. (1993) · The Journal of Chemical Physics · doi:10.1063/1.464913 · Cited by 103,767 · see citing works
Projector augmented-wave method
Blöchl, P. E. (1994) · Physical Review B · doi:10.1103/physrevb.50.17953 · Cited by 92,732 · see citing works
From ultrasoft pseudopotentials to the projector augmented-wave method
Kresse, G., & Joubert, D. (1999) · Physical Review B · doi:10.1103/physrevb.59.1758 · Cited by 85,307 · see citing works
The SIESTA method for ab initio order- N materials simulation
Soler, J. M., Artacho, E., Gale, J. D., Garcı́a, A., Junquera, J., Ordejón, P., & Sánchez‐Portal, D. (2002) · Journal of Physics Condensed Matter · doi:10.1088/0953-8984/14/11/302 · Cited by 12,302 · see citing works
Phonons and related crystal properties from density-functional perturbation theory
Stefano Baroni, A., de Gironcoli, S., Corso, A. D., & Giannozzi, P. (2001) · Reviews of Modern Physics · doi:10.1103/revmodphys.73.515 · Cited by 10,017 · see citing works
Tao, J., Perdew, J. P., Staroverov, V. N., & Scuseria, G. E. (2003) · Physical Review Letters · doi:10.1103/physrevlett.91.146401 · Cited by 7,107 · see citing works
Georges, A., Kotliar, G., Krauth, W., & Rozenberg, M. J. (1996) · Reviews of Modern Physics · doi:10.1103/revmodphys.68.13 · Cited by 6,901 · see citing works
Understanding Molecular Simulation: From Algorithms to Applications
Ratner, M. A. (1997) · Physics Today · doi:10.1063/1.881812 · Cited by 5,114 · see citing works
Density-functional theory and strong interactions: Orbital ordering in Mott-Hubbard insulators
Liechtenstein, A. I., Anisimov, V. I., & Zaanen, J. (1995) · Physical review. B, Condensed matter · doi:10.1103/physrevb.52.r5467 · Cited by 4,819 · see citing works
Wales, D. J., & Doye, J. P. K. (1997) · The Journal of Physical Chemistry A · doi:10.1021/jp970984n · Cited by 3,030 · see citing works
Quantum Monte Carlo simulations of solids
Foulkes, W. M. C., Mitáš, L., Needs, R. J., & Rajagopal, G. (2001) · Reviews of Modern Physics · doi:10.1103/revmodphys.73.33 · Cited by 2,318 · see citing works
How to Solve It: Modern Heuristics
Michalewicz, Z., & Fogel, D. B. (2000) · Springer eBooks · doi:10.1007/978-3-662-04131-4 · Cited by 2,216 · see citing works
Post-Perovskite Phase Transition in MgSiO 3
Murakami, M., Hirose, K., Kawamura, K., et al. (2004) · Science · doi:10.1126/science.1095932 · Cited by 1,340 · see citing works
REVIEWS in MINERALOGY and GEOchEMIStRY
Hazen, R. M., & Jones, A. (2013) · Cited by 1,183 · see citing works
Molecular Geometry Optimization with a Genetic Algorithm
Deaven, D. M., & Ho, K. M. (1995) · Physical Review Letters · doi:10.1103/physrevlett.75.288 · Cited by 1,149 · see citing works
On the Possibility of a Metallic Modification of Hydrogen
Wigner, E. P., & Huntington, H. B. (1935) · The Journal of Chemical Physics · doi:10.1063/1.1749590 · Cited by 1,116 · see citing works
Theoretical and experimental evidence for a post-perovskite phase of MgSiO3 in Earth's D″ layer
Оганов, А. Р., & Ono, S. (2004) · Nature · doi:10.1038/nature02701 · Cited by 999 · see citing works
Single-bonded cubic form of nitrogen
Eremets, M. I., Gavriliuk, A. G., Trojan, I. A., et al. (2004) · Nature Materials · doi:10.1038/nmat1146 · Cited by 957 · see citing works
Predicting Crystal Structures: The Parrinello-Rahman Method Revisited
Martoňák, R., Laio, A., & Parrinello, M. (2003) · Physical Review Letters · doi:10.1103/physrevlett.90.075503 · Cited by 894 · see citing works
Goedecker, S. (2004) · The Journal of Chemical Physics · doi:10.1063/1.1724816 · Cited by 878 · see citing works
Mailhiot, C., Yang, L., & McMahan, A. K. (1992) · Physical review. B, Condensed matter · doi:10.1103/physrevb.46.14419 · Cited by 490 · see citing works
Crystals from first principles
Maddox, J. (1988) · Nature · doi:10.1038/335201a0 · Cited by 466 · see citing works
A third blind test of crystal structure prediction
Day, G. M., MOTHERWELL, W. D. S., Ammon, H. L., et al. (2005) · Acta Crystallographica Section B Structural Science · doi:10.1107/s0108768105016563 · Cited by 431 · see citing works
Optical studies of solid hydrogen to 320 GPa and evidence for black hydrogen
Loubeyre, P., Occelli, F., & Toullec, R. L. (2002) · Nature · doi:10.1038/416613a · Cited by 416 · see citing works
The crystal structures of new forms of silicon and germanium
Kasper, J. S., & Richards, S. M. (1964) · Acta Crystallographica · doi:10.1107/s0365110x64001840 · Cited by 406 · see citing works
The prediction of inorganic crystal structures using a genetic algorithm and energy minimisation
Woodley, S. M., Battle, P. D., Gale, J. D., & Catlow, C. R. A. (1999) · Physical Chemistry Chemical Physics · doi:10.1039/a901227c · Cited by 356 · see citing works
High-pressure phases of CaCO3: Crystal structure prediction and experiment
Оганов, А. Р., Glass, C. W., & Ono, S. (2005) · Earth and Planetary Science Letters · doi:10.1016/j.epsl.2005.10.014 · Cited by 345 · see citing works
Self-citationUnderstanding the valency of rare earths from first-principles theory
Strange, P., Svane, A., Temmerman, W. M., Szotek, Z., & Winter, H. (1999) · Nature · doi:10.1038/21595 · Cited by 306 · see citing works
The melting curve of iron at the pressures of the Earth's core from ab initio calculations
Alfè, D., Gillan, M. J., & Price, G. D. (1999) · Nature · doi:10.1038/46758 · Cited by 304 · see citing works
Schön, J. C., & Jansen, M. (1996) · Angewandte Chemie International Edition in English · doi:10.1002/anie.199612861 · Cited by 300 · see citing works
Physics of solids under strong compression
Holzapfel, W. B. (1996) · Reports on Progress in Physics · doi:10.1088/0034-4885/59/1/002 · Cited by 287 · see citing works
Possible thermal and chemical stabilization of body-centred-cubic iron in the Earth's core
Vočadlo, L., Alfè, D., Gillan, M. J., et al. (2003) · Nature · doi:10.1038/nature01829 · Cited by 286 · see citing works
Shimizu, K., Suhara, K., Ikumo, M., et al. (1998) · Nature · doi:10.1038/31656 · Cited by 278 · see citing works
Combined Electronic Structure and Evolutionary Search Approach to Materials Design
Jóhannesson, G. H., Bligaard, T., Ruban, A. V., Skriver, H. L., Jacobsen, K. W., & Nørskov, J. K. (2002) · Physical Review Letters · doi:10.1103/physrevlett.88.255506 · Cited by 278 · see citing works
Prediction of crystal structures from crystal chemistry rules by simulated annealing
Pannetier, J., Bassas, J., Rodríguez-Carvajal, J., & Caignaert, V. (1990) · Nature · doi:10.1038/346343a0 · Cited by 273 · see citing works
Fuchs, M., & Gonze, X. (2002) · Physical review. B, Condensed matter · doi:10.1103/physrevb.65.235109 · Cited by 250 · see citing works
Stability of the body-centred-cubic phase of iron in the Earth's inner core
Belonoshko, A. B., Ahuja, R., & Johansson, B. (2003) · Nature · doi:10.1038/nature01954 · Cited by 244 · see citing works
Solid hydrogen at 342 GPa: no evidence for an alkali metal
Narayana, C., Luo, H., Orloff, J., et al. (1998) · Nature · doi:10.1038/29949 · Cited by 243 · see citing works
Anisotropy of Earth's D″ layer and stacking faults in the MgSiO3 post-perovskite phase
Оганов, А. Р., Martoňák, R., Laio, A., Raiteri, P., & Parrinello, M. (2005) · Nature · doi:10.1038/nature04439 · Cited by 226 · see citing works
GULP: Capabilities and prospects
Gale, J. D. (2005) · Zeitschrift für Kristallographie - Crystalline Materials · doi:10.1524/zkri.220.5.552.65070 · Cited by 219 · see citing works
High-pressure structural and electronic properties of carbon
Fahy, S., & Louie, S. G. (1987) · Physical review. B, Condensed matter · doi:10.1103/physrevb.36.3373 · Cited by 217 · see citing works
Dissociation of MgSiO 3 in the Cores of Gas Giants and Terrestrial Exoplanets
Umemoto, K., Wentzcovitch, R. M. M., & Allen, P. B. (2006) · Science · doi:10.1126/science.1120865 · Cited by 190 · see citing works
Akahama, Y., Kawamura, H., Häusermann, D. M., et al. (1995) · Physical Review Letters · doi:10.1103/physrevlett.74.4690 · Cited by 187 · see citing works
Optical Evidence for the Metallization of Xenon at 132(5) GPa
Goettel, K. A., Eggert, J. H., Silvera, I. F., et al. (1989) · Physical Review Letters · doi:10.1103/physrevlett.62.665 · Cited by 186 · see citing works
Structural stability of silica at high pressures and temperatures
Оганов, А. Р., Gillan, M. J., & Price, G. D. (2005) · Physical Review B · doi:10.1103/physrevb.71.064104 · Cited by 177 · see citing works
Ab initio lattice dynamics and structural stability of MgO
Оганов, А. Р., Gillan, M. J., & Price, G. D. (2003) · The Journal of Chemical Physics · doi:10.1063/1.1570394 · Cited by 163 · see citing works
Evolutionary programming techniques for predicting inorganic crystal structures
Bush, T. S., Catlow, C. R. A., & Battle, P. D. (1995) · Journal of Materials Chemistry · doi:10.1039/jm9950501269 · Cited by 155 · see citing works
Post-aragonite phase transformation in CaCO3 at 40 GPa
Ono, S. (2005) · American Mineralogist · doi:10.2138/am.2005.1610 · Cited by 150 · see citing works
The ε Phase of Solid Oxygen: Evidence of an O4 Molecule Lattice
Gorelli, F. A., Ulivi, L., Santoro, M., et al. (1999) · Physical Review Letters · doi:10.1103/physrevlett.83.4093 · Cited by 150 · see citing works
High-Pressure Transformation of Al 2 O 3
Funamori, N., & Jeanloz, R. (1997) · Science · doi:10.1126/science.278.5340.1109 · Cited by 144 · see citing works
Raman, infrared, and x-ray evidence for new phases of nitrogen at high pressures and temperatures
Gregoryanz, E., Goncharov, A. F., Hemley, R. J., et al. (2002) · Physical review. B, Condensed matter · doi:10.1103/physrevb.66.224108 · Cited by 138 · see citing works
The high-pressure phase of alumina and implications for Earth's D″ layer
Оганов, А. Р., & Ono, S. (2005) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.0501800102 · Cited by 126 · see citing works
Simulation of structural phase transitions by metadynamics
Martoňák, R., Laio, A., Bernasconi, M., Ceriani, C., Raiteri, P., Zipoli, F., & Parrinello, M. (2005) · Zeitschrift für Kristallographie - Crystalline Materials · doi:10.1524/zkri.220.5.489.65078 · Cited by 121 · see citing works
Electrical Conductivity of Xenon at Megabar Pressures
Eremets, M. I., Gregoryanz, E., Стружкин, В. В., et al. (2000) · Physical Review Letters · doi:10.1103/physrevlett.85.2797 · Cited by 114 · see citing works
Spectroscopic studies of the vibrational and electronic properties of solid hydrogen to 285 GPa
Goncharov, A. F., Gregoryanz, E., Hemley, R. J., et al. (2001) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.201528198 · Cited by 106 · see citing works
Novel chain structures in group VI elements
Degtyareva, O., Gregoryanz, E., Somayazulu, M. S., et al. (2005) · Nature Materials · doi:10.1038/nmat1294 · Cited by 106 · see citing works
Neutron and X-ray diffraction study of the broken symmetry phase transition in solid deuterium
Goncharenko, I. N., & Loubeyre, P. (2005) · Nature · doi:10.1038/nature03699 · Cited by 105 · see citing works
Oxygen phase equilibria near 298 K
Nicol, M. F., Hirsch, K. R., & Holzapfel, W. B. (1979) · Chemical Physics Letters · doi:10.1016/0009-2614(79)80066-4 · Cited by 96 · see citing works
High-pressure phase transition of hematite, Fe2O3
Ono, S., Kikegawa, T., & Ohishi, Y. (2004) · Journal of Physics and Chemistry of Solids · doi:10.1016/j.jpcs.2003.11.042 · Cited by 93 · see citing works
Polymorphs of Alumina Predicted by First Principles: Putting Pressure on the Ruby Pressure Scale
Thomson, K. T., Wentzcovitch, R. M. M., & Bukowinski, M. S. T. (1996) · Science · doi:10.1126/science.274.5294.1880 · Cited by 91 · see citing works
Prediction of Crystal Structures Using Evolutionary Algorithms and Related Techniques
Woodley, S. M. (2004) · Structure and bonding · doi:10.1007/b13934 · Cited by 85 · see citing works
Evidence for a Magnetic Collapse in the Epsilon Phase of Solid Oxygen
Goncharenko, I. N. (2005) · Physical Review Letters · doi:10.1103/physrevlett.94.205701 · Cited by 71 · see citing works
Prediction of a new phase transition in Al 2 O 3 at high pressures
Caracas, R., & Cohen, R. E. (2005) · Geophysical Research Letters · doi:10.1029/2004gl022204 · Cited by 66 · see citing works
Weir, S. T., Mitchell, A. C., & Nellis, W. J. (1996) · Journal of Applied Physics · doi:10.1063/1.362946 · Cited by 66 · see citing works
Low-Energy Linear Structures in Dense Oxygen: Implications for the ε Phase
Neaton, J. B., & Ashcroft, N. W. (2002) · Physical Review Letters · doi:10.1103/physrevlett.88.205503 · Cited by 66 · see citing works
Incommensurate sulfur above 100GPa
Hejny, C., Lundegaard, L. F., Falconi, S., et al. (2005) · Physical Review B · doi:10.1103/physrevb.71.020101 · Cited by 65 · see citing works
The structure of iron under the conditions of the Earth's inner core
Vočadlo, L., Brodholt, J. P., Alfè, D., et al. (1999) · Geophysical Research Letters · doi:10.1029/1999gl900214 · Cited by 57 · see citing works
Spiral chain structure of high pressure selenium−II′ and sulfur−II from powder x-ray diffraction
Fujihisa, H., Akahama, Y., Kawamura, H., et al. (2004) · Physical Review B · doi:10.1103/physrevb.70.134106 · Cited by 56 · see citing works
Crystal structure of sulfur and selenium at pressures up to 160 GPa
Degtyareva, O., Gregoryanz, E., Mao, H. K., et al. (2005) · High Pressure Research · doi:10.1080/08957950412331331682 · Cited by 53 · see citing works
In situ structure solution of helical sulphur at 3GPa and 400ºC
Crichton, W. A., Vaughan, G., & Mézouar, M. (2001) · Zeitschrift für Kristallographie - Crystalline Materials · doi:10.1524/zkri.216.8.417.20360 · Cited by 47 · see citing works
Alternating sequence of ring and chain structures in sulphur at high pressure and temperature
Crapanzano, L., Crichton, W. A., Monaco, G., et al. (2005) · Nature Materials · doi:10.1038/nmat1417 · Cited by 42 · see citing works
Theoretical stability limit of diamond at ultrahigh pressure
Clark, S. J., Ackland, G. J., & Crain, J. N. (1995) · Physical review. B, Condensed matter · doi:10.1103/physrevb.52.15035 · Cited by 40 · see citing works
A new high-pressure phase of strontium carbonate
Ono, S., Shirasaka, M., Kikegawa, T., et al. (2005) · Physics and Chemistry of Minerals · doi:10.1007/s00269-004-0428-5 · Cited by 34 · see citing works
Sulfur Melting and Polymorphism under Pressure: Outlines of Fields for 12 Crystalline Phases
Vezzoli, G. C., Dachille, F., & Roy, R. (1969) · Science · doi:10.1126/science.166.3902.218 · Cited by 29 · see citing works
STM3: a chemistry visualization platform
Valle, M. (2005) · Zeitschrift für Kristallographie - Crystalline Materials · doi:10.1524/zkri.220.5.585.65068 · Cited by 18 · see citing works
An Introduction to Evolutionary Computation and Evolutionary Algorithms
Cartwright, H. (2004) · Structure and bonding · doi:10.1007/b13931 · Cited by 15 · see citing works
Hama, J., & Suito, K. (2002) · High Temperatures-High Pressures · doi:10.1068/htjr033 · Cited by 11 · see citing works
Flagged first, then by citations
Cited by
Sorted by citations
Commentary: The Materials Project: A materials genome approach to accelerating materials innovation
Jain, A., Ong, S. P., Hautier, G., Chen, W., Richards, W. D., Dacek, S., Cholia, S., Gunter, D., Skinner, D., Ceder, G., et al. (2013) · APL Materials · doi:10.1063/1.4812323 · Cited by 13,094 · see citing works
Towards the computational design of solid catalysts
Nørskov, J. K., Bligaard, T., Rossmeisl, J., & Christensen, C. H. (2009) · Nature Chemistry · doi:10.1038/nchem.121 · Cited by 4,161 · see citing works
The high-throughput highway to computational materials design
Curtarolo, S., Hart, G. L. W., Nardelli, M. B., Mingo, N., Sanvito, S., & Levy, O. (2013) · Nature Materials · doi:10.1038/nmat3568 · Cited by 2,053 · see citing works
<i>Ab initio</i> random structure searching
Pickard, C. J., & Needs, R. J. (2011) · Journal of Physics: Condensed Matter · doi:10.1088/0953-8984/23/5/053201 · Cited by 1,302 · see citing works
From DFT to machine learning: recent approaches to materials science–a review
Schleder, G. R., Padilha, A. C. M., Acosta, C. M., Costa, M., & Fazzio, A. (2019) · Journal of Physics: Materials · doi:10.1088/2515-7639/ab084b · Cited by 852 · see citing works
Hautier, G., Fischer, C. C., Jain, A., Mueller, T., & Ceder, G. (2010) · Chemistry of Materials · doi:10.1021/cm100795d · Cited by 580 · see citing works
Unsupervised machine learning in atomistic simulations, between predictions and understanding
Ceriotti, M. (2019) · The Journal of Chemical Physics · doi:10.1063/1.5091842 · Cited by 173 · see citing works
Application of machine learning for advanced material prediction and design
Chan, C. H., Sun, M., & Huang, B. (2022) · EcoMat · doi:10.1002/eom2.12194 · Cited by 123 · see citing works
Artificial intelligence-driven approaches for materials design and discovery
Cheng, M., Fu, C.-L., Okabe, R., Chotrattanapituk, A., Boonkird, A., Hung, N. T., & Li, M. (2026) · Nature Materials · doi:10.1038/s41563-025-02403-7 · Cited by 109 · see citing works
Machine learning in materials design: Algorithm and application*
Song, Z., Chen, X., Meng, F., Cheng, G., Wang, C., Sun, Z., & Yin, W.-J. (2020) · Chinese Physics B · doi:10.1088/1674-1056/abc0e3 · Cited by 63 · see citing works
Chen, H.-Z., Zhang, Y.-Y., Gong, X., & Xiang, H. (2014) · The Journal of Physical Chemistry C · doi:10.1021/jp411437f · Cited by 40 · see citing works
Benchmark Test of Black-box Optimization Using D-Wave Quantum Annealer
Koshikawa, A. S., Ohzeki, M., Kadowaki, T., & Tanaka, K. (2021) · Journal of the Physical Society of Japan · doi:10.7566/jpsj.90.064001 · Cited by 43 · see citing works
Generative AI for crystal structures: A review
De Breuck, P.-P., Wang, H.-C., Rignanese, G.-M., Botti, S., & Marques, M. A. L. (2025) · npj Computational Materials · doi:10.1038/s41524-025-01881-2 · Cited by 24 · see citing works
- Authors
- Oganov, A. R., & Glass, C. W.
- Affiliations
- ETH Zurich Laboratory of Crystallography, Department of Materials, , HCI G 515, Wolfgang-Pauli-Strasse 10, CH-8093 Zurich, Switzerland
- ETH Zurich (CH)
- ORCID
- Glass, Colin W.
- Venue
- The Journal of Chemical Physics
- Publisher
- AIP Publishing
- Published
- 2006-06-28
- Volume
- 124
- Issue
- 24
- Pages
- 244704-244704
- ISSN
- 0021-9606 (ISSN-L)
- 1089-7690
- OpenAlex
- W2024330948
- Cited by
- 2,596
- References
- 79
- Citations by year
- 2026: 121 · 2025: 164 · 2024: 189 · 2023: 177 · 2022: 199 · 2021: 208 · 2020: 261 · 2019: 175 · 2018: 199 · 2017: 156 · 2016: 135 · 2015: 137 · 2014: 107 · 2013: 71 · 2012: 65
- FWCI
- 32.19
- Type
- journal article
- Language
- en
- Open access
- green
- arxiv.org
- Locations
- The Journal of Chemical Physics (publishedVersion)
- PubMed (publishedVersion)
- arXiv (Cornell University) (submittedVersion)
- arXiv (Cornell University)
- Funders
- National Science Foundation
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (111847, 200021-111847/1, 200021)
- Eidgenössische Technische Hochschule Zürich
- China Scholarship Council
- Topics
- Physical Sciences › Earth and Planetary Sciences › Geophysics › High-pressure geophysics and materials
- Physical Sciences › Materials Science › Materials Chemistry › Machine Learning in Materials Science
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Advanced Chemical Physics Studies
- Keywords
- crystal structure prediction, evolutionary algorithms, ab initio total energy calculations, metastable phases, high-pressure crystal structure, high-pressure carbon, high-pressure nitrogen, phase stability
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.
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.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review