Schott Sk6, 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	1.21206115E+00;
B2	3.47221122E-01;
B3	9.72025014E-01;
C1	6.65602562E-03;
C2	2.24384733E-02;
C3	1.10082121E+02;