Histograms of a) radius of the sources; b) mass; c) H2 surface density; d) temperature; e) luminosity; and f) luminosity-to-mass ratio, for 24 μm-bright (solid line) and 24 μm-dark (dashed line) sources. The dotted line in panel c) indicates the minimum surface density needed to form massive stars according to theory (Butler & Tan 2012).
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