a) CS (1–0) velocity map around RCW 36 in Vela C with column density contours overlaid (levels: 5, 15, 25, 35, and 45% of the 1.8 × 10²³ cm^-2 column density). b) CS(1−0) integrated spectra around RCW 36. The spectra are spatially integrated in the coloured circles showed in Fig. 2a. CS (blue) and C³⁴S (red) lines towards pillar 1 are presented in the bottom panel. c) Position−velocity diagram for a shell, which is expanding radially beyond the clumps. The diagram is built by taking the mean velocity around a circle for a given radius (the angular offset). Each circle is centred on the star cluster. The colour indicates the line intensity. d) Velocity−position diagramme for the area in Fig. 7a based on the vertical profile of the CS velocity, which is averaged horizontally. 0 offset corresponds to RCW 36.