Schott Sk1, 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	1.23997939E+00;
B2	3.08829519E-01;
B3	1.03366266E+00;
C1	6.76460788E-03;
C2	2.33830716E-02;
C3	1.14585882E+02;