5 term Cauchy (sort of) for index, Gaussian absorption function, fit to SiO
USER
2 1
A+B/wvl+C/wvl^2+D/wvl^3+F/wvl^4+G/wvl^5
1.e5*ampl*exp(-((((wvl-beta)/broad)^2)^expon))
A 1.740746
B 0.345053
C -0.419762
D 0.294969
F -0.081607
G 0.007431
ampl 0.000007
beta 0.179748
broad 0.172135
expon 1.844570