Constant low-luminosity model (Model1). Top row: comparison of the observations (contours) with the synthetic maps (color background). Top left: C¹⁸O (2–1). The inlay in the upper right corner of the left map shows a zoom into the C¹⁸ O emission within the central 2″. Right: N₂H⁺ (1–0); integration intervals are the same as in Fig. 1, while the contour spacing is in steps of 3σ, starting at 3σ. The dotted line shows the direction of the cuts through the maps, while the dashed line illustrates the outflow direction. The white dashed circle marks a radius of 10″. The scalingof the maps can be understood in comparison with the cuts in the bottom row. Bottom row: cuts at PA = 138° for C¹⁸ O (left) and N₂H⁺ (right). Gray lines show the data, red lines the model, and the dotted gray lines show the 3σ.