Schott BK6, 313nm - 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 1.002819e+000
C1 5.747159e-003
B2 3.095685e-001
C2 1.920457e-002
B3 1.018406e+000
C3 1.087608e+002