Schott Sk5, 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	9.91463823E-01;
B2	4.95982121E-01;
B3	9.87393925E-01;
C1	5.22730467E-03;
C2	1.72733646E-02;
C3	9.83594579E+01;