Distributions of a) radius of the sources; b) mass; c) H2 surface density; d) temperature; e) luminosity; and f) luminosity-to-mass ratio as a function of the distance to the G29-UC region for 24 μm-bright (filled circles) and 24 μm-dark (open red circles) sources. The dotted line in the surface density distributions indicates the minimum value needed to form massive stars according to theory (Butler & Tan 2012). The first bin contains only one point and, thus, the standard deviation is zero.
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