Total luminosities and central stellar mass of the Herschel YSOs. Top panels: a) ratio of the sub-mm luminosity (integrated SED for λ ≥ 350   μm) and the total luminosity obtained from the Robitaille models for all sources with an acceptable SED fit. The vertical dash-dotted red line marks the transition between Class 0 (L_submm/L_tot ≥ 0.005) and Class I objects (see Andre et al. 1993). b) Histogram of the stellar mass. The solid red line shows the IMF with a slope of γ =  −1.35. Middle panels: c) histogram of the total luminosity obtained from the Robitaille models for sources with an acceptable SED fit (gray histogram). Overploted are the integrated far-infrared luminosity L_int,FIR of all sources with an acceptable SED fit (dotted red histogram), and the integrated far-infrared luminosity of all Herschel point-like sources in the CNC with fluxes detected in minimum three bands and without an SED fit (solid blue histogram). d) Cumulative distribution function of the integrated far-infrared luminosity of all sources with an acceptable SED fit (red pluses), and the integrated far-infrared luminosity of all Herschel point-like sources in the CNC with fluxes detected in minimum three bands and without an SED fit (blue crosses). Bottom panels: e) total luminosity obtained from the Robitaille models versus the integrated far-infrared luminosity for all sources with an acceptable SED fit. The solid red line marks a ratio of 1. f) Same as c), but now with the distribution of the integrated far-infrared luminosity of all Herschel point-like sources in the CNC with fluxes detected in minimum three bands and without an SED fit (solid blue) multiplied by the median value of L_tot/L_FIR for YSOs with SED fit (dash-dotted blue).