Temperature corrected mass versus distance distribution. Dotted lines show the mass sensitivity corresponding to the flux density threshold of 5 Jy using T_d = 30 K for infrared-bright (red), and T_d = 18 K for infrared-quiet clumps (green). Coloured symbols are shown in the figure legend; filled circles correspond to sources where our selection is complete, while filled triangles show sources where the sample is incomplete above 650 M_⊙. The dashed horizontal line shows the 650 M_⊙ limit for massive clumps potentially capable of forming high-mass stars from Csengeri et al. (2014). Known (proto)clusters from the literature are labelled with magenta stars, as are the estimated initial clump mass at half-radius for the galactic (super) star clusters like the Orion Nebula Cluster (ONC, e.g. Da Rio et al. 2012) and Arches (Habibi et al. 2013), following Tan et al. (2014). The approximate distance limit for detecting sources corresponding to cores, clumps, and cloud fragments is shown as a dotted line (Bergin & Tafalla 2007).