Fig. 17.

Inset: optical spectra after absolute flux calibration and extinction correction, fitted by a single BB function. The parts of the spectrum in light gray were excluded from the fit because of the presence of strong emission lines. Main panel: NIR spectra after absolute flux calibration (using J band) and extinction correction, fitted either by a single BB (at early epochs), or by a sum (magenta) of two BB components, one warm (red) and one hot (blue). The warm (red) component dominates at late epochs. The flux of the last spectrum was multiplied by five for a better visualization.
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