Schott KzFS N4, 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	1.37994218E+00;
B2	1.68496708E-01;
B3	8.74885726E-01;
C1	8.91159699E-03;
C2	4.05334070E-02;
C3	6.96628237E+01;