Top: distribution of kinematic distances for the observed fields (see Table 1 for references). Middle: distribution of bolometric luminosities for the fields centered on an IRAS source. Bottom: distribution of the sum of the masses of the millimeter sources within the observed fields (from Beltrán et al. 2006). At the top of each panel we indicate the total number of sources used in the histogram, the mean, the standard deviation, and the median. The vertical dashed lines indicate the median values.