Azimuthally averaged radial intensity profile of H₂CO 3_1, 2 − 2_1, 1 (in mJy beam⁻¹ km s⁻¹, red line) and of the 1.3 mm continuum (in K, blue line). For the continuum the conversion factor from brightness temperature to flux density is 0.65 mJy beam⁻¹ K⁻¹. The shaded areas indicate the dispersion of the intensity values around the mean along each annulus in the radial direction. The vertical black dotted lines indicate the position of the CO iceline, the change in the polarization orientation, and the H₂CO emission peak.