Azimuthally averaged column density (top, small symbols), volume density (top, large symbols), and temperature (bottom) distributions. The data for the cometary tail and the west wing are taken from the MBB, whereas the data for the core is the result of the RT fit (Sect. 3.2). The pixels within a beam size from the Class I protostar IRS are excluded. The solid line shows the curves for the best-fit model (Table 1), the dotted line indicates the beam size.