Iridium, fit from bulk sample
nm
NK
250	1.3403	2.3524
260	1.4062	2.3706
270	1.4684	2.4156
280	1.5455	2.4772
290	1.6085	2.5029
300	1.6712	2.5191
310	1.7116	2.534
320	1.7477	2.6051
330	1.7562	2.6262
340	1.7628	2.6629
350	1.7718	2.7182
360	1.7892	2.7782
370	1.8132	2.8333
380	1.8439	2.8881
390	1.8765	2.9445
400	1.9098	2.9953
410	1.9409	3.0509
420	1.9709	3.1016
430	1.9951	3.154
440	2.0249	3.2004
450	2.0519	3.2491
460	2.0799	3.2945
470	2.104	3.3462
480	2.1319	3.3957
490	2.1579	3.4535
500	2.1888	3.5096
510	2.223	3.5482
520	2.2518	3.6036
530	2.2859	3.6451
540	2.3173	3.7015
550	2.3484	3.739
560	2.378	3.782
570	2.4067	3.8306
580	2.4352	3.8657
590	2.4661	3.9056
600	2.4957	3.941
610	2.5232	3.9861
620	2.5516	4.0222
630	2.5763	4.0536
640	2.6015	4.1018
650	2.6266	4.1279
660	2.6503	4.1632
670	2.6736	4.1967
680	2.6953	4.2354
690	2.7154	4.2712
700	2.7352	4.3099
710	2.7562	4.3408
720	2.7745	4.3739
730	2.7929	4.4075
740	2.8108	4.4397
750	2.8271	4.4805
760	2.841	4.511
770	2.859	4.5365
780	2.8722	4.5823
790	2.889	4.6146
800	2.9058	4.6504
810	2.9178	4.6861
820	2.9335	4.7267
830	2.9467	4.7662
840	2.9592	4.7969
850	2.9754	4.8332
860	2.9874	4.8802
870	2.9976	4.9218
880	3.0178	4.9508
890	3.0298	4.9965
900	3.0426	5.0338
910	3.0569	5.0702
920	3.0679	5.1079
930	3.0803	5.1404
940	3.0944	5.1751
950	3.1078	5.2225
960	3.1177	5.267
970	3.1286	5.2943
980	3.143	5.3259
990	3.1515	5.3724
1000	3.162	5.4009
1010	3.1714	5.4403
1020	3.1813	5.486
1030	3.1903	5.5225
1040	3.2012	5.5548
1050	3.2097	5.6121
1060	3.2197	5.6407
1070	3.2289	5.6694
1080	3.2393	5.7106
1090	3.2496	5.7421
1100	3.2587	5.7815
1110	3.268	5.8203
1120	3.2785	5.8383
1130	3.2876	5.8867
1140	3.2978	5.914
1150	3.3081	5.9543
1160	3.3172	5.9935
1170	3.3263	6.031
1180	3.3367	6.048
1190	3.346	6.0913
1200	3.3559	6.131
1210	3.3654	6.1741
1220	3.3754	6.1924
1230	3.3852	6.2244
1240	3.3946	6.255
1250	3.4046	6.2894
1260	3.4136	6.3166
1270	3.4233	6.3444
1280	3.4329	6.3955
1290	3.4425	6.4391
1300	3.4518	6.449
1310	3.4617	6.4971
1320	3.4715	6.5265
1330	3.4805	6.5658
1340	3.4904	6.5932
1350	3.4996	6.6218
1360	3.5095	6.6635
1370	3.5188	6.6911
1380	3.5278	6.7119
1390	3.5374	6.7375
1400	3.5472	6.7765
1410	3.5566	6.8117
1420	3.5659	6.8336
1430	3.5749	6.8758
1440	3.5847	6.9065
1450	3.5938	6.9175
1460	3.603	6.9467
1470	3.6124	6.9795
1480	3.6217	7.0143
1490	3.6308	7.0325
1500	3.6399	7.0729
1510	3.6492	7.0942
1520	3.6591	7.1419
1530	3.6676	7.1475
1540	3.6774	7.1923
1550	3.6867	7.2362
1560	3.6955	7.2385
1570	3.7043	7.2684
1580	3.7137	7.2983
1590	3.7236	7.3463
1600	3.7323	7.3803
1610	3.7411	7.393
1620	3.7502	7.4265
1630	3.7594	7.4509
1640	3.7679	7.4746
1650	3.7767	7.4964
1660	3.7864	7.5327
1670	3.7948	7.5504
1680	3.8038	7.5787
1690	3.8141	7.6237
1700	3.8235	7.67