Schott KF 3, 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	1.15615178E+00;
B2	1.02116759E-01;
B3	9.27164575E-01;
C1	7.89264815E-03;
C2	3.45076496E-02;
C3	1.13531069E+02;