Fig. 5
SED of massive stars. The total emission is fit by adding to the photosphere (yellow) either free–free (left blue dotted lines) or dust emission in apertures as labelled (right red-brown lines). Data (black) are from optical catalogues as available at VizieR/CDS, 2MASS, WISE, Spitzer/IRS, and Herschel/PACS with 1σ error bars and 3σ upper limits.
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