Schott BaLF 4, 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	1.29375981E+00;
B2	1.58138572E-01;
B3	9.47442773E-01;
C1	7.80228251E-03;
C2	3.21349048E-02;
C3	1.09158657E+02;