Schott BK1, 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 1.042505e+000
C1 6.165690e-003
B2 2.083803e-001
C2 2.121528e-002
B3 9.801482e-001
C3 1.090609e+002