Schott BaSF 51, 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	1.67507496E+00;
B2	2.12822109E-01;
B3	9.66557263E-01;
C1	1.05667060E-02;
C2	4.76664644E-02;
C3	9.20388572E+01;