# data from www.luxpop.com database
# ;  Optical constants for Nb
# ; 
# ;   taken from:
# ;
# ;   'Handbook of Optical Constants of Solids II', Ed. by Edward D. Palik,
# ;   Academic Press, Inc., 1991.
# ;   
# ;    Lambda (A)            n            k
# ;-----------------------------------------
309.950012 2.640000
317.897003 2.620000
326.263000 2.590000
335.081024 2.560000
344.389008 2.520000
354.229004 2.480000
364.647003 2.460000
375.696991 2.440000
387.437988 2.450000
399.935028 2.480000
413.266998 2.510000
435.018036 2.580000
450.835999 2.660000
467.849030 2.740000
486.196014 2.830000
506.041016 2.890000
527.575012 2.920000
551.022034 2.930000
576.651001 2.920000
604.781006 2.890000
635.795044 2.820000
670.162048 2.690000
708.456970 2.540000
751.393982 2.360000
799.871033 2.150000
855.033997 1.950000