Column density profile (dashed black line) and averaged column density (blue line) vs. radius (r). The blue triangle shows the averaged column density estimate from ACA array observations from Csengeri et al. (2017a). The green circle corresponds to the beam-averaged column density estimated from ATLASGAL (Csengeri et al. 2014). The yellow square shows the column density estimates roughly at the position of the accretion shocks with ALMA (Csengeri et al. 2019). The error bars indicate a 20% error on these measurements.