Schott LaK 9, 334nm - 2325nm
USER
2 1
SQRT(1+B1*wvl^2/(wvl^2-C1)+B2*wvl^2/(wvl^2-C2)+B3*wvl^2/(wvl^2-C3))
0
B1	1.46231905E+00;
B2	3.44399589E-01;
B3	1.15508372E+00;
C1	7.24270156E-03;
C2	2.43353131E-02;
C3	8.54686868E+01;