Schott LaK N6, 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	1.15477318E+00;
B2	4.97049217E-01;
B3	1.00553588E+00;
C1	5.83257597E-03;
C2	1.94613961E-02;
C3	9.78667698E+01;