Niobium pentoxide
nm
NK
250	2.8549	1.226
260	3.0013	1.1356
270	3.0819	0.93899
280	3.163	0.76686
290	3.1775	0.59601
300	3.1635	0.4323
310	3.1007	0.30665
320	3.0171	0.19552
330	2.9235	0.10981
340	2.8375	0.056264
350	2.7627	0.027398
360	2.7151	0.021459
370	2.6601	0.0098753
380	2.6224	0.0053606
390	2.5903	0.0030535
400	2.5637	0.0020711
410	2.5396	0.00072413
420	2.5205	0
430	2.5019	0.00026334
440	2.487	0.00061068
450	2.4741	0.0010227
460	2.463	0.00019215
470	2.4527	0.00018246
480	2.441	0
490	2.433	0
500	2.4246	0
510	2.4139	0
520	2.4071	0
530	2.3992	0
540	2.3833	0.039121
550	2.3867	0.0022969
560	2.3782	0
570	2.3773	0
580	2.3707	0
590	2.3663	0
600	2.3607	0.0032469
610	2.3585	0
620	2.3527	0.0024431
630	2.3516	0.0010502
640	2.3479	0.0012766
650	2.3457	0
660	2.3405	0.0021215
670	2.3382	0
680	2.338	0
690	2.3352	0.0062124
700	2.3313	0
710	2.3284	0
720	2.3289	0.0018969
730	2.3281	0
740	2.3223	0.0013285
750	2.3224	0.0036165
760	2.3187	0
770	2.3205	0.0015849
780	2.3138	0.0010019
790	2.3132	0.0010893
800	2.3114	0.00079329
810	2.3117	0.0009486
820	2.3105	0
830	2.309	0.00038976
840	2.3056	0
850	2.3036	0
860	2.3015	0
870	2.3072	0
880	2.3044	0
890	2.2998	0
900	2.3014	0.00018425
910	2.2991	0
920	2.2983	0.0012114
930	2.2978	0
940	2.2937	0
950	2.295	0.0017299
960	2.2948	0.0038889
970	2.2946	0.0020154
980	2.2934	0.0014955
990	2.2924	0.00089106
1000	2.2935	0.0016483