Masses of the YSO envelopes or of compact condensations estimated from the Herschel fluxes. Here we use only sources that have four or five measured Herschel fluxes. We estimate the masses M(BB) using a modified blackbody model. We estimate the masses M(Robitaille et al.) using ROB07 SED fitting-tool. The red dashed line shows equality between the two masses and we find no sources located along it. The red solid line shows where the points should lie, taking into account the different dust opacities used in the mass estimations. The black and coloured dots are respectively for sources with 4 and 5 measured fluxes. Yellow and green dots are respectively for hot (T ~ 25.8 K in Fig. 10) and cold (T ~ 15.7 K in Fig. 10) sources. The horizontal bars indicate the range of values obtained using ROB07’s SED fitting-tool.