# this file is part of refractiveindex.info database
# refractiveindex.info database is in the public domain
# copyright and related rights waived via CC0 1.0

REFERENCES: |
    M. R. Querry. Optical constants, <a href="https://apps.dtic.mil/sti/citations/ADA158623"><i>Contractor Report</i> CRDC-CR-85034 (1985)</a>
COMMENTS: |
    Graphite pellet from Asbury Micro 260 powder.
DATA:
  - type: tabulated nk
    data: |
        0.2100 0.860 0.689
        0.2200 0.905 0.784
        0.2300 0.973 0.880
        0.2400 1.067 0.969
        0.2500 1.198 1.026
        0.2600 1.336 1.019
        0.2700 1.431 0.969
        0.2800 1.485 0.916
        0.2900 1.516 0.873
        0.3000 1.535 0.840
        0.3100 1.547 0.813
        0.3200 1.554 0.796
        0.3300 1.562 0.785
        0.3400 1.570 0.771
        0.3500 1.569 0.760
        0.3600 1.569 0.758
        0.3700 1.570 0.759
        0.3800 1.574 0.762
        0.3900 1.579 0.766
        0.4000 1.585 0.768
        0.4100 1.590 0.769
        0.4200 1.593 0.772
        0.4300 1.596 0.776
        0.4400 1.599 0.781
        0.4500 1.602 0.788
        0.4600 1.606 0.795
        0.4700 1.611 0.802
        0.4800 1.616 0.810
        0.4900 1.622 0.817
        0.5000 1.629 0.822
        0.5100 1.634 0.828
        0.5200 1.638 0.834
        0.5300 1.643 0.840
        0.5400 1.647 0.846
        0.5500 1.652 0.853
        0.5600 1.656 0.860
        0.5700 1.659 0.867
        0.5800 1.664 0.875
        0.5900 1.669 0.882
        0.6000 1.673 0.889
        0.6100 1.677 0.897
        0.6200 1.681 0.904
        0.6300 1.685 0.912
        0.6400 1.689 0.920
        0.6500 1.693 0.927
        0.6600 1.696 0.935
        0.6700 1.699 0.945
        0.6800 1.704 0.954
        0.6900 1.709 0.963
        0.7000 1.714 0.972
        0.7100 1.719 0.980
        0.7200 1.724 0.989
        0.7300 1.729 0.997
        0.7400 1.734 1.006
        0.7500 1.739 1.014
        0.7600 1.744 1.023
        0.7700 1.750 1.032
        0.7800 1.755 1.040
        0.7900 1.761 1.048
        0.8000 1.768 1.055
        0.8100 1.773 1.060
        0.8200 1.776 1.068
        0.8300 1.781 1.076
        0.8400 1.785 1.083
        0.8500 1.789 1.091
        0.8600 1.793 1.098
        0.8700 1.796 1.107
        0.8800 1.801 1.116
        0.8900 1.806 1.124
        0.9000 1.809 1.131
        0.9117 1.813 1.140
        0.9200 1.817 1.150
        0.9300 1.821 1.159
        0.9400 1.826 1.168
        0.9500 1.831 1.177
        0.9600 1.836 1.186
        0.9700 1.841 1.195
        0.9800 1.846 1.204
        0.9900 1.851 1.212
        1.0000 1.857 1.221
        1.0100 1.862 1.229
        1.0200 1.867 1.238
        1.0300 1.872 1.246
        1.0400 1.877 1.255
        1.0500 1.882 1.263
        1.0600 1.888 1.272
        1.0700 1.893 1.281
        1.0800 1.899 1.290
        1.0900 1.905 1.298
        1.1000 1.910 1.306
        1.1100 1.915 1.314
        1.1200 1.920 1.323
        1.1300 1.925 1.333
        1.1400 1.932 1.342
        1.1500 1.938 1.350
        1.1600 1.944 1.358
        1.1700 1.950 1.367
        1.1800 1.957 1.375
        1.1900 1.962 1.383
        1.2000 1.970 1.392
        1.2100 1.977 1.398
        1.2200 1.982 1.406
        1.2300 1.989 1.415
        1.2400 1.995 1.422
        1.2500 2.001 1.430
        1.2600 2.008 1.437
        1.2700 2.015 1.445
        1.2800 2.021 1.452
        1.2900 2.026 1.460
        1.3000 2.033 1.467
        1.3100 2.040 1.475
        1.3200 2.046 1.483
        1.3300 2.053 1.490
        1.3400 2.060 1.497
        1.3500 2.067 1.503
        1.3600 2.073 1.510
        1.3700 2.079 1.517
        1.3800 2.086 1.524
        1.3900 2.093 1.531
        1.4000 2.099 1.537
        1.4100 2.105 1.544
        1.4200 2.112 1.550
        1.4300 2.117 1.557
        1.4400 2.124 1.564
        1.4500 2.131 1.570
        1.4600 2.137 1.576
        1.4700 2.143 1.583
        1.4800 2.149 1.590
        1.4900 2.155 1.596
        1.5000 2.162 1.604
        1.5100 2.170 1.610
        1.5205 2.177 1.616
        1.5300 2.183 1.621
        1.5400 2.189 1.627
        1.5500 2.195 1.634
        1.5600 2.203 1.640
        1.5700 2.209 1.646
        1.5800 2.216 1.650
        1.5900 2.221 1.657
        1.6000 2.228 1.663
        1.6100 2.235 1.669
        1.6200 2.241 1.674
        1.6300 2.248 1.679
        1.6400 2.253 1.685
        1.6500 2.260 1.691
        1.6600 2.266 1.697
        1.6700 2.273 1.703
        1.6800 2.279 1.708
        1.6900 2.286 1.714
        1.7000 2.293 1.719
        1.7100 2.299 1.724
        1.7200 2.305 1.729
        1.7300 2.311 1.735
        1.7400 2.318 1.741
        1.7500 2.325 1.746
        1.7662 2.331 1.751
        1.7700 2.338 1.756
        1.7800 2.345 1.761
        1.7900 2.352 1.766
        1.8000 2.360 1.770
        1.8100 2.366 1.773
        1.8200 2.371 1.777
        1.8300 2.377 1.783
        1.8400 2.385 1.787
        1.8500 2.392 1.791
        1.8600 2.398 1.793
        1.8700 2.402 1.796
        1.8800 2.407 1.801
        1.8900 2.413 1.806
        1.9000 2.419 1.810
        1.9100 2.424 1.814
        1.9200 2.430 1.818
        1.9300 2.435 1.823
        1.9400 2.441 1.827
        1.9500 2.447 1.831
        1.9600 2.453 1.835
        1.9700 2.459 1.839
        1.9800 2.464 1.843
        1.9900 2.470 1.847
        2.0000 2.477 1.851
        2.0100 2.482 1.852
        2.0200 2.486 1.857
        2.0300 2.492 1.861
        2.0400 2.497 1.865
        2.0500 2.502 1.868
        2.0600 2.508 1.872
        2.0700 2.513 1.875
        2.0800 2.518 1.879
        2.0900 2.523 1.882
        2.1000 2.526 1.886
        2.1100 2.533 1.888
        2.1200 2.537 1.892
        2.1300 2.542 1.895
        2.1400 2.547 1.898
        2.1500 2.551 1.902
        2.1600 2.556 1.906
        2.1700 2.560 1.909
        2.1800 2.564 1.912
        2.1900 2.568 1.916
        2.2000 2.572 1.920
        2.2100 2.576 1.924
        2.2200 2.581 1.928
        2.2300 2.585 1.931
        2.2400 2.589 1.935
        2.2500 2.594 1.939
        2.2600 2.598 1.942
        2.2700 2.601 1.946
        2.2800 2.605 1.950
        2.2900 2.609 1.954
        2.3000 2.613 1.958
        2.3100 2.617 1.962
        2.3200 2.621 1.966
        2.3300 2.625 1.971
        2.3400 2.629 1.975
        2.3500 2.633 1.979
        2.3600 2.637 1.983
        2.3700 2.641 1.987
        2.3800 2.645 1.992
        2.3900 2.650 1.996
        2.4000 2.654 1.999
        2.4100 2.658 2.003
        2.4200 2.662 2.007
        2.4300 2.666 2.012
        2.4400 2.670 2.015
        2.4500 2.674 2.019
        2.4600 2.677 2.023
        2.4700 2.681 2.028
        2.4800 2.685 2.032
        2.4900 2.688 2.037
        2.5000 2.691 2.043
        2.5063 2.696 2.047
        2.5126 2.699 2.045
        2.5189 2.699 2.051
        2.5253 2.705 2.053
        2.5316 2.707 2.054
        2.5381 2.709 2.057
        2.5445 2.709 2.061
        2.5510 2.714 2.066
        2.5575 2.718 2.067
        2.5641 2.719 2.069
        2.5707 2.722 2.073
        2.5773 2.725 2.074
        2.5840 2.727 2.078
        2.5907 2.730 2.081
        2.5974 2.732 2.086
        2.6042 2.738 2.086
        2.6110 2.736 2.088
        2.6178 2.741 2.093
        2.6247 2.741 2.096
        2.6316 2.746 2.100
        2.6385 2.749 2.103
        2.6455 2.753 2.107
        2.6525 2.757 2.109
        2.6596 2.758 2.111
        2.6667 2.760 2.117
        2.6738 2.766 2.118
        2.6810 2.766 2.122
        2.6882 2.771 2.126
        2.6954 2.775 2.129
        2.7027 2.778 2.131
        2.7100 2.779 2.134
        2.7174 2.784 2.142
        2.7248 2.791 2.141
        2.7322 2.791 2.145
        2.7397 2.796 2.149
        2.7473 2.797 2.150
        2.7548 2.800 2.154
        2.7624 2.803 2.158
        2.7701 2.807 2.163
        2.7778 2.812 2.166
        2.7855 2.817 2.168
        2.7933 2.816 2.171
        2.8011 2.823 2.176
        2.8090 2.827 2.176
        2.8169 2.827 2.178
        2.8249 2.830 2.186
        2.8329 2.837 2.190
        2.8409 2.841 2.193
        2.8490 2.844 2.196
        2.8571 2.850 2.200
        2.8653 2.853 2.201
        2.8736 2.857 2.205
        2.8818 2.859 2.205
        2.8902 2.860 2.211
        2.8986 2.865 2.216
        2.9070 2.869 2.222
        2.9155 2.877 2.226
        2.9240 2.881 2.226
        2.9326 2.886 2.228
        2.9412 2.885 2.231
        2.9499 2.890 2.237
        2.9586 2.895 2.242
        2.9674 2.902 2.245
        2.9762 2.904 2.248
        2.9851 2.910 2.254
        2.9940 2.916 2.253
        3.0030 2.917 2.255
        3.0120 2.922 2.263
        3.0211 2.929 2.265
        3.0303 2.930 2.269
        3.0395 2.939 2.273
        3.0488 2.942 2.273
        3.0581 2.945 2.277
        3.0675 2.949 2.280
        3.0769 2.953 2.285
        3.0864 2.959 2.287
        3.0960 2.962 2.291
        3.1056 2.968 2.296
        3.1153 2.973 2.298
        3.1250 2.976 2.301
        3.1348 2.983 2.307
        3.1447 2.989 2.308
        3.1546 2.993 2.310
        3.1646 2.996 2.313
        3.1746 3.003 2.318
        3.1847 3.006 2.320
        3.1949 3.011 2.324
        3.2051 3.018 2.325
        3.2154 3.019 2.327
        3.2258 3.023 2.334
        3.2362 3.030 2.340
        3.2468 3.039 2.339
        3.2573 3.041 2.341
        3.2680 3.046 2.345
        3.2787 3.048 2.347
        3.2895 3.053 2.353
        3.3003 3.061 2.356
        3.3113 3.065 2.357
        3.3223 3.070 2.361
        3.3333 3.075 2.361
        3.3445 3.078 2.366
        3.3557 3.083 2.370
        3.3670 3.087 2.374
        3.3784 3.092 2.377
        3.3898 3.100 2.381
        3.4014 3.104 2.380
        3.4130 3.104 2.386
        3.4247 3.111 2.390
        3.4364 3.117 2.393
        3.4483 3.121 2.396
        3.4602 3.125 2.400
        3.4722 3.130 2.404
        3.4843 3.135 2.406
        3.4965 3.139 2.410
        3.5088 3.142 2.415
        3.5211 3.146 2.422
        3.5336 3.157 2.424
        3.5461 3.161 2.427
        3.5587 3.166 2.432
        3.5714 3.172 2.435
        3.5842 3.178 2.438
        3.5971 3.184 2.441
        3.6101 3.187 2.444
        3.6232 3.192 2.450
        3.6364 3.200 2.451
        3.6496 3.203 2.455
        3.6630 3.210 2.460
        3.6765 3.215 2.462
        3.6900 3.220 2.465
        3.7037 3.223 2.468
        3.7175 3.227 2.474
        3.7313 3.236 2.478
        3.7453 3.240 2.480
        3.7594 3.242 2.486
        3.7736 3.250 2.492
        3.7879 3.258 2.494
        3.8023 3.263 2.498
        3.8168 3.268 2.502
        3.8314 3.273 2.506
        3.8462 3.281 2.511
        3.8610 3.287 2.513
        3.8760 3.290 2.515
        3.8911 3.294 2.520
        3.9063 3.299 2.527
        3.9216 3.307 2.533
        3.9370 3.312 2.536
        3.9526 3.319 2.542
        3.9683 3.327 2.544
        3.9841 3.332 2.549
        4.0000 3.337 2.551
        4.0161 3.341 2.557
        4.0323 3.350 2.561
        4.0486 3.355 2.563
        4.0650 3.359 2.571
        4.0816 3.370 2.573
        4.0984 3.374 2.576
        4.1152 3.378 2.580
        4.1322 3.382 2.587
        4.1494 3.385 2.590
        4.1667 3.392 2.595
        4.1841 3.393 2.600
        4.2017 3.391 2.614
        4.2194 3.403 2.636
        4.2373 3.429 2.645
        4.2553 3.439 2.640
        4.2735 3.447 2.649
        4.2918 3.467 2.650
        4.3103 3.477 2.643
        4.3290 3.484 2.639
        4.3478 3.486 2.639
        4.3668 3.489 2.642
        4.3860 3.491 2.647
        4.4053 3.496 2.654
        4.4248 3.504 2.659
        4.4444 3.511 2.663
        4.4643 3.517 2.669
        4.4843 3.525 2.672
        4.5045 3.528 2.676
        4.5249 3.536 2.683
        4.5455 3.544 2.686
        4.5662 3.550 2.692
        4.5872 3.557 2.699
        4.6083 3.564 2.703
        4.6296 3.571 2.712
        4.6512 3.581 2.712
        4.6729 3.582 2.719
        4.6948 3.596 2.729
        4.7170 3.606 2.730
        4.7393 3.610 2.733
        4.7619 3.617 2.742
        4.7847 3.626 2.748
        4.8077 3.637 2.755
        4.8309 3.647 2.754
        4.8544 3.650 2.758
        4.8780 3.659 2.764
        4.9020 3.665 2.770
        4.9261 3.676 2.777
        4.9505 3.683 2.781
        4.9751 3.687 2.783
        5.0000 3.681 2.798
        5.0251 3.700 2.820
        5.0505 3.720 2.823
        5.0761 3.733 2.828
        5.1020 3.746 2.830
        5.1282 3.756 2.833
        5.1546 3.766 2.838
        5.1813 3.778 2.843
        5.2083 3.789 2.846
        5.2356 3.800 2.849
        5.2632 3.809 2.853
        5.2910 3.820 2.857
        5.3191 3.829 2.861
        5.3476 3.841 2.867
        5.3763 3.852 2.868
        5.4054 3.861 2.871
        5.4348 3.870 2.875
        5.4645 3.880 2.879
        5.4945 3.891 2.884
        5.5249 3.901 2.886
        5.5556 3.910 2.891
        5.5866 3.921 2.893
        5.6180 3.929 2.895
        5.6497 3.938 2.900
        5.6818 3.945 2.903
        5.7143 3.954 2.912
        5.7471 3.967 2.915
        5.7803 3.976 2.918
        5.8140 3.986 2.922
        5.8480 3.994 2.924
        5.8824 4.002 2.929
        5.9172 4.013 2.938
        5.9524 4.026 2.937
        5.9880 4.030 2.942
        6.0241 4.040 2.946
        6.0606 4.046 2.952
        6.0976 4.059 2.957
        6.1350 4.065 2.957
        6.1728 4.073 2.965
        6.2112 4.074 2.966
        6.2500 4.067 2.982
        6.2893 4.083 3.015
        6.3291 4.120 3.026
        6.3694 4.141 3.017
        6.4103 4.148 3.013
        6.4516 4.159 3.014
        6.4935 4.163 3.020
        6.5359 4.177 3.027
        6.5789 4.187 3.030
        6.6225 4.197 3.034
        6.6667 4.205 3.040
        6.7114 4.216 3.047
        6.7568 4.228 3.051
        6.8027 4.237 3.055
        6.8493 4.247 3.062
        6.8966 4.258 3.068
        6.9444 4.268 3.074
        6.9930 4.277 3.080
        7.0423 4.288 3.088
        7.0922 4.301 3.094
        7.1429 4.309 3.100
        7.1942 4.323 3.106
        7.2464 4.332 3.109
        7.2993 4.342 3.118
        7.3529 4.352 3.123
        7.4074 4.366 3.130
        7.4627 4.372 3.131
        7.5188 4.378 3.142
        7.5758 4.388 3.149
        7.6336 4.398 3.158
        7.6923 4.409 3.165
        7.7519 4.417 3.175
        7.8125 4.430 3.185
        7.8740 4.433 3.188
        7.9365 4.441 3.207
        8.0000 4.456 3.217
        8.0645 4.466 3.230
        8.1301 4.481 3.243
        8.1967 4.494 3.252
        8.2645 4.507 3.262
        8.3333 4.519 3.272
        8.4034 4.534 3.285
        8.4746 4.549 3.296
        8.5470 4.562 3.304
        8.6207 4.572 3.310
        8.6957 4.582 3.323
        8.7719 4.600 3.339
        8.8496 4.614 3.344
        8.9286 4.621 3.354
        9.0090 4.631 3.368
        9.0909 4.643 3.368
        9.1743 4.665 3.402
        9.2593 4.681 3.409
        9.3458 4.691 3.421
        9.4340 4.706 3.434
        9.5238 4.721 3.450
        9.6154 4.741 3.464
        9.7087 4.753 3.471
        9.8039 4.765 3.488
        9.9010 4.784 3.497
        10.0000 4.791 3.513
        10.1010 4.806 3.531
        10.2041 4.822 3.546
        10.3093 4.839 3.561
        10.4167 4.856 3.580
        10.5263 4.874 3.595
        10.6383 4.891 3.608
        10.7527 4.907 3.620
        10.8696 4.920 3.636
        10.9890 4.935 3.651
        11.1111 4.947 3.666
        11.2360 4.959 3.686
        11.3636 4.968 3.702
        11.4943 4.977 3.744
        11.6279 5.018 3.767
        11.7647 5.032 3.775
        11.9048 5.045 3.797
        12.0482 5.061 3.819
        12.1951 5.075 3.846
        12.3457 5.098 3.877
        12.5000 5.124 3.900
        12.6582 5.144 3.918
        12.8205 5.160 3.943
        12.9870 5.186 3.971
        13.1579 5.207 3.991
        13.3333 5.222 4.015
        13.5135 5.240 4.044
        13.6986 5.259 4.071
        13.8889 5.276 4.103
        14.0845 5.296 4.133
        14.2857 5.313 4.165
        14.4928 5.326 4.210
        14.7059 5.358 4.256
        14.9254 5.392 4.293
        15.1515 5.420 4.320
        15.3846 5.433 4.357
        15.6250 5.447 4.404
        15.8730 5.479 4.469
        16.1290 5.522 4.511
        16.3934 5.558 4.559
        16.6667 5.594 4.600
        16.9492 5.625 4.651
        17.2414 5.665 4.698
        17.5439 5.705 4.748
        17.8571 5.746 4.798
        18.1818 5.778 4.849
        18.5185 5.816 4.906
        18.8679 5.858 4.962
        19.2308 5.902 5.022
        19.6078 5.939 5.076
        20.0000 5.965 5.149
        20.4082 6.015 5.234
        20.8333 6.065 5.317
        21.2766 6.128 5.406
        21.7391 6.184 5.484
        22.2222 6.248 5.576
        22.7273 6.315 5.670
        23.2558 6.403 5.774
        23.8095 6.496 5.863
        24.3902 6.583 5.955
        25.0000 6.665 6.046
        25.6410 6.753 6.154
        26.3158 6.864 6.257
        27.0270 6.960 6.362
        27.7778 7.073 6.474
        28.5714 7.165 6.580
        29.4118 7.269 6.767
        30.3030 7.456 6.925
        31.2500 7.616 7.057
        32.2581 7.798 7.193
        33.3333 7.970 7.361
        34.4828 8.216 7.528
        35.7143 8.443 7.671
        37.0370 8.719 7.833
        38.4615 9.032 7.910
        40.0000 9.205 8.039
        41.6667 9.632 8.238
        43.4783 9.809 8.196
        45.4545 10.079 8.493
        47.6190 10.478 8.667
        50.0000 10.837 8.888
        52.6316 11.354 9.407
        55.5556 12.433 9.539