New Atlases for Solar Flux, Irradiance, Central Intensity, and Limb Intensity
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  (clic sull'immagine per vederla a dimensione reale)  
  The blue end of one of the FTS scans is shown in green. A continuum, smooth green line, is subjectively fitted to the scans by comparing to predictions from calculations of the solar spectrum and the telluric spectrum. When a reasonable looking fit has been obtained through iteration, the spectrum is divided by the continuum value to produce a residual spectrum shown in red. The top 1 percent of the residual spectrum is replotted in red as well. The blue curve is the the transmission curve for O_3 and [O_2]_2 that has already been divided out.  
R.L. Kurucz