Mass distribution of the methyl formate sources (black hatched histogram) computed using T_d = 100 K for all sources except the six most extreme ones, for which we used 300 K instead. The magenta lines in the middle panel show in comparison the mass distributions obtained for 100 realizations of randomly sampled temperatures between 50 and 150 K (or 200 and 400 K for the six most extreme sources). The blue histogram in the top panel shows the mass distribution of all cores, i.e., all compact dust continuum cores (without free-free contaminated sources) plus all the methyl formate sources. In the bottom panel we removed from the blue histogram 22 compact dust continuum cores for which the PPMAP method does not provide robust temperature estimates. The red line shows the ratio of methyl formate sources to the total number of cores per bin.