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Fig. 1


Sky subtraction. Shown is the spectrum of a single spaxel of CAL 83 with the scaled telluric spectrum overplotted. Below each plot are the residuals. On thetop one notices the difference in the flux of the brightest sky lines with the rest (see text). On thebottom one can see S-shaped residuals which are a result of spectral PSF differences (see text).

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