*_*.csv
First column:
Number of datalines, starting wavelength, ending wavelength, stepping
Second column:
Wavelngth in mu, Fluxdensity in photons/s/nm/arcsec^2/m^2

Rousellot.csv:
First Coloumn:
Number of datalines, starting wavelength, ending wavelength
Second column:
Wavelngth in mu, Intensity is proportional to the flux of photons