Distribution of clump size (panel a) and clump mass (panel b) for the three subregions of NGC 2264: central (hatched black histograms), northern (red histograms), and southern (blue histograms) subregions. The central subregion has an excess of high-mass clumps comparedthe northern and southern subregions. The angular resolution of our observations, 18.2′′, is given in panel a. The completeness levels, ~2.7 M_⊙ in the central subregion and ~1.5 M_⊙ in the northern and southern subregions, are indicated in panel b with dotted lines.