Schott LaK 11, 313nm - 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	1.05088219E+00;
B2	6.51491084E-01;
B3	1.03286344E+00;
C1	4.82822430E-03;
C2	1.83961539E-02;
C3	8.98416133E+01;