Schott SSK 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	1.42691045E+00;
B2	1.41195647E-01;
B3	9.86004821E-01;
C1	8.31214602E-03;
C2	3.34369911E-02;
C3	1.09701359E+02;