Histograms of several properties of our HCG sample. Early type galaxies are marked in red and late type galaxies in blue: a) the distributions of the stellar masses (M _∗ ), b) the distributions of the star formation rates (SFR), c) the distributions of specific SFR (sSFR), and d) the histogram of the IR luminosities, L_IR, in red, as estimated by our SED modeling. Because of the absence of far-IR observations for most of the sample, we overplot in hashed areas the histograms corresponding to the minimum and maximum L_IR of each galaxy, associated to the 16th and 84th percentile ranges of the best fit, respectively, e) a histogram of the extinction inferred from the SED fit (A_V,   obs) as measured model-derived atttenuated and unattenuated SED (see Sect. 3.1.3).