Schott LaK 8, 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	1.33183167E+00;
B2	5.46623206E-01;
B3	1.19084015E+00;
C1	6.20023871E-03;
C2	2.16465439E-02;
C3	8.25827736E+01;