Radial profiles of the integrated line intensity for the CH₃CN J = 12−11, K = 3 transition. The radial profiles proceed from west to east and r = 0 corresponds to the center of the considered molecular centers. The first two profiles (MC-4 and MC-11) are taken from the newly introduced molecular centers in the northern region (cf. Fig. 4). The third profile (MC-68) is taken from the molecular center located between the continuum cores M-SMA-6 and M-SMA-8. The last profile (MC-9) is centered around the molecular center south to the continuum core M-SMA-9. In all panels the blue dashed line shows the observational data, whereas the red solid line corresponds to the simulated data.