Schott LaK 33, 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	1.45796869E+00;
B2	5.55403936E-01;
B3	1.19938794E+00;
C1	6.80545280E-03;
C2	2.25253283E-02;
C3	8.27543327E+01;