Schott Sk13, 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	9.22627573E-01;
B2	5.70303629E-01;
B3	9.79881211E-01;
C1	4.61930582E-03;
C2	1.80622701E-02;
C3	1.10419538E+02;