Distribution of the peak flux density of the detected sources. The ATLASGAL sources from the current paper are shown in the black histogram with gray. The blue line shows the sources from Contreras et al. (2013). The black dashed line shows the measured slope of the distribution, and green indicates the star-forming ATLASGAL clumps (see Sect. 5 for details). A black dotted line corresponds to our 7σ completeness limit when using an average of 70 mJy/beam noise level. The fits to the slope of the distributions are shown in dashed colored lines. We note that here we show the source count per bin, while in Rosolowsky et al. (2010) and Contreras et al. (2013) the differential source count, ΔN/ ΔF_ν is shown.