optical constants of high index material from pt-by-pt fit
nm
NK
250	2.7511	1.4462
255	2.8087	1.4541
260	2.9678	1.4684
265	3.0231	1.4302
270	3.1124	1.3292
275	3.2035	1.2459
280	3.2765	1.165
285	3.3222	1.0761
290	3.4009	0.94496
295	3.4402	0.83733
300	3.4865	0.71979
305	3.3311	0.55165
310	3.2994	0.51841
315	3.2896	0.46326
320	3.2728	0.39642
325	3.2466	0.33493
330	3.2057	0.27319
335	3.1607	0.21809
340	3.0399	0.15514
345	3.0495	0.12
350	3.0069	0.090646
355	2.9593	0.070894
360	2.9148	0.057314
365	2.8792	0.046554
370	2.8483	0.038006
375	2.819	0.031013
380	2.7962	0.026568
385	2.7743	0.023415
390	2.7549	0.029493
395	2.7217	0.018284
400	2.7065	0.01055
405	2.6918	0.0091264
410	2.6788	0.008423
415	2.6665	0.0079756
420	2.6526	0.0085048
425	2.6392	0.0083674
430	2.6193	0.0099571
435	2.6116	0.010519
440	2.5987	0.0095464
445	2.5895	0.0067926
450	2.5814	0.00568
455	2.573	0.0048104
460	2.566	0.0040988
465	2.5595	0.0035491
470	2.5531	0.003204
475	2.5461	0.0032867
480	2.5401	0.0035717
485	2.5334	0.0037924
490	2.5271	0.003473
495	2.522	0.0037411
500	2.5116	0.0049453
505	2.5094	0.0044979
510	2.5059	0.0024408
515	2.5011	0.0014329
520	2.4968	0.00068568
525	2.4929	0.00039701
530	2.4884	8.1322e-005
535	2.4854	6.1549e-005
540	2.4825	0
545	2.4804	0
550	2.4769	0
555	2.4727	0
560	2.4695	0
565	2.4666	0.00026414
570	2.463	0.0011716
575	2.4593	0.0013963
580	2.4569	0.00086506
585	2.4539	0.00096945
590	2.4504	0.0010727
595	2.4501	0.0019245
600	2.448	0.003032
605	2.4454	0.003998
610	2.4439	0.0049036
615	2.4423	0.0050219
620	2.4403	0.004692
625	2.4383	0.0042003
630	2.4355	0.0035733
635	2.4338	0.0032581
640	2.4322	0.0030501
645	2.4311	0.0031866
650	2.4295	0.0029001
655	2.4264	0.0021246
660	2.4248	0.0017237
665	2.4245	0.0016682
670	2.4229	0.0010997
675	2.4207	0.00071465
680	2.4177	4.0452e-005
685	2.416	0
690	2.4159	0
695	2.4161	0
700	2.4146	0.00069423
705	2.4136	0.00033567
710	2.4128	0.00032054
715	2.4116	0.00023106
720	2.4093	0.00081743
725	2.4046	0.002621
730	2.4	0.0012355
735	2.4021	0.0026738
740	2.403	0.0041558
745	2.403	0.0055415
750	2.4031	0.0071249
755	2.4039	0.0076015
760	2.4046	0.0073928
765	2.4053	0.0066193
770	2.4038	0.0057521
775	2.402	0.0049895
780	2.4007	0.0042869
785	2.3993	0.0036265
790	2.3991	0.0033218
795	2.3983	0.003279
800	2.3973	0.0031239
805	2.3958	0.0029004
810	2.3952	0.0028469
815	2.3941	0.0025241
820	2.3924	0.0021064
825	2.3923	0.0021578
830	2.3908	0.0018512
835	2.3903	0.0018816
840	2.39	0.0018595
845	2.3894	0.0019411
850	2.3878	0.0016692
855	2.3872	0.0015822
860	2.3866	0.0017024
865	2.3856	0.0015429
870	2.3848	0.0013591
875	2.3837	0.0011107
880	2.3825	0.0010014
885	2.3824	0.00096261
890	2.3819	0.00087521
895	2.3813	0.00094206
900	2.3806	0.00093604
905	2.3801	0.00094888
910	2.3793	0.00093184
915	2.3783	0.00083962
920	2.3782	0.0010647
925	2.3777	0.0012673
930	2.377	0.0014753
935	2.3767	0.0016763
940	2.3763	0.0019958
945	2.3761	0.002483
950	2.3755	0.0026942
955	2.3754	0.0032317
960	2.3763	0.0047576
965	2.3773	0.0062544
970	2.3784	0.0088141
975	2.3688	0
980	2.3673	0
985	2.3673	0
990	2.3669	0
995	2.3665	0
1000	2.3664	0