Fig. A.1
L-band SED and optical depth of the sources towards the SVS 4 cluster. Left: the dotted blue and orange lines show the blackbody functions we used to determine the continuum (magenta line) by fitting the dark grey photometric points. The temperature of each blackbody component is shown in the upper left corner of each panel and is given in K. Right: L-band observations towards the SVS 4 sources on an optical depth scale. The dashed black lines are used as a reference for τ = 0.
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