Source mass distribution in Vela-C. The error bars correspond to statistical uncertainties. Continuous red line represents the fit to the linear portion of the mass distribution (namely that consistent with a single straight line within the errorbars) for all prestellar sources. A similar fit performed on the restricted sample of prestellar sources with diameters less than 0.08 pc is represented with a grey dashed line. The derived slopes are reported as well. Mass distribution of CO clumps (Kramer et al. 1998), the single-star IMF (Kroupa 2001) and the multiple-system IMF (Chabrier 2005) are shown for comparison with an orange, a green, and a blue line, respectively. The dotted vertical line represents the mass completeness limit of prestellar sources.