Schott F 6, 365nm - 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	1.38640043E+00;
B2	2.16317468E-01;
B3	9.20242786E-01;
C1	1.03119848E-02;
C2	4.82391922E-02;
C3	1.11029425E+02;