Schott F 1, 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	1.36192123E+00;
B2	2.09162831E-01;
B3	9.07276681E-01;
C1	1.02049225E-02;
C2	4.80290444E-02;
C3	1.09211919E+02;