Intensity profiles of different tracers (see legend in the top left panel) along different cuts through the eastern shell (left column) and the northern shell (right column). All the molecular line intensities were extracted from their velocity-integrated intensity maps. The extents and directions of the cuts are shown in the left three-color image of Fig. 12. For improved visibility, the Brγ-H₂ intensity profiles are shifted by −0.8, while the SiO profiles are moved by +0.2 along the y-axis. The vertical dashed lines indicate the depths in the intensity profiles of Brγ-H₂.