Schott F 15, 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	1.31031527E+00;
B2	2.02636884E-01;
B3	9.20049222E-01;
C1	9.54034890E-03;
C2	4.55807051E-02;
C3	1.09864711E+02;