Schott PSK3, 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 8.872721e-001
C1 4.698241e-003
B2 4.895924e-001
C2 1.618185e-002
B3 1.048653e+000
C3 1.043750e+002