Schott F 4, 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	1.33905825E+00;
B2	2.05224318E-01;
B3	8.97859758E-01;
C1	9.92220114E-03;
C2	4.70000918E-02;
C3	1.07936750E+02;