YSCC bolometric luminosity in erg s^-1 and visual extinction are plotted in panel a) and b), respectively, as a function of the total luminous mass of GMC hosting the YSCC. Blue circles are embedded b-type sources, red squares are YSCCs of c1-type, and green stars are YSCCs of c2-type. In panel c) the flux density at 24 μm in units of mJy arcsec^-2 (see text for more details) is plotted as a function of the total GMC luminous mass. Open cyan circles are C-type clouds, blue crosses are B-type clouds, and magenta triangles are A-type clouds.