Schott LaK N12, 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	1.17365704E+00;
B2	5.88992398E-01;
B3	9.78014394E-01;
C1	5.77031797E-03;
C2	2.00401678E-02;
C3	9.54873482E+01;