Fig. A.5
The relative blue-to-red ratio between SDSS spectra and observed CALIFA V500 galaxy spectra (matched to the SDSS fiber aperture) along wavelength. All CALIFA spectra shown were obtained during the photometric night (2012 January 20th) and flux calibrated using the single pointing standard star observation of that night. A fourth order polynomial functions is sufficient to describe the trend presumably originating from the aperture losses of the standard star observation.
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