from Stevenson (1994) MNRAS 
-----------------------------

wvlngth transmission
 (nm)     (%)
600.737 100.119
612.044 99.7692
622.313 99.5376
626.743 98.9086
627.709 92.9131
629.483 96.8193
635.972 99.7416
638.613 98.875
642.378 99.7448
647.102 96.3546
649.369 94.7383
650.576 99.2754
651.629 94.9367
652.649 99.0792
659.338 99.1219
671.49 99.3252
677.428 98.3419
681.666 98.7779
686.097 97.9517
686.956 71.0093
688.005 91.7594
690.097 86.8689
692.046 94.4438
694.509 90.8158
696.837 97.7203
699.392 94.8813
707.761 98.7908
712.656 99.6216
716.152 97.1776
717.624 82.1093
718.677 77.8889
719.796 80.8875
721.999 95.4842
723.271 83.4927
726.271 87.1234
728.352 85.152
730.877 89.7292
733.205 96.6337
742.897 99.676
746.38 100.112
748.825 101.257
751.659 99.4831
755.8 100.471
759.859 26.1932
761.761 69.6656
763.242 52.3882
763.242 52.3882
767.78 96.4141
773.423 98.8232
784.065 99.6568
789.068 96.9768
793.396 98.4385
795.669 95.3233
798.58 97.8494
803.482 96.9051
805.167 99.6672
811.303 96.3566
815.608 79.7907
819.171 84.0134
821.581 93.9554
822.798 71.9836
825.821 93.9181
828.302 85.8325
832.523 90.5289
836.743 95.2647
843.798 97.9506
855.853 98.7849
871.771 99.6212
877.892 100.255
880.155 99.7831
884.478 102.428
886.286 97.8926
888.819 100.419
893.734 96.279
896.61 83.736
898.82 72.4945
899.259 80.7393
901.25 77.5055
903.542 93.6408
905.049 93.7993
906.888 81.1375
909.524 81.6911
911.109 85.8733
913.137 73.1721
913.954 80.9832
915.109 74.8299
916.475 86.9411
918.56 83.5496
920.961 95.9373
926.07 90.2988
929.079 67.8546
933.267 32.8271
934.361 42.295
936.728 39.1009
939.079 64.3092
943.242 59.7353
943.273 51.8063
945.168 49.0854
947.499 55.2009
949.652 58.5945
949.677 52.4012
951.421 64.0786
952.792 50.7065
954.366 57.6895
957.467 59.624
956.963 68.0261
959.156 61.5183
962.604 70.9086
966.733 75.1315
967.228 92.9621
971.177 94.8181
975.649 83.7355
977.333 86.6949
979.399 88.3922
982.753 97.743
986.985 99.7569
990.198 97.1155
993.292 100.943
1000.18 97.9093
1001.31 98.3438