Schott F 13, 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	1.35316545E+00;
B2	2.07756817E-01;
B3	9.02160492E-01;
C1	1.00820559E-02;
C2	4.77132466E-02;
C3	1.09426810E+02;