Left panel: the mass spectrum of the sources in the G29-SFR cloud. The solid line represents the Salpeter IMF, dN/d, the dotted line is a −2.15 power law, and the dashed line is a −1.7 power law. The vertical dotted line indicates the completeness limit of 49 M_⊙ for a temperature of 20 K. Right panel: the normalized cumulative mass distribution of sources with masses above 300 M_⊙ (well above the completeness limit: see Sect. 4.4). The solid, dotted, and dashed lines are the same as in the left panel.