Schott F 9, 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	1.37298383E+00;
B2	1.86344373E-01;
B3	9.96847110E-01;
C1	9.70906764E-03;
C2	4.77952149E-02;
C3	1.09902441E+02;