Schott KF 6, 313nm - 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	1.17006893E+00;
B2	9.50509747E-02;
B3	9.07409125E-01;
C1	8.14992422E-03;
C2	3.88216817E-02;
C3	1.08882299E+02;