a) Three-colour image of the RCW 36 cavity (see Fig. 1) corresponding to the field mapped by P-ArTéMiS. Red is the column density that is shown for values between 3 × 10²¹ and 5 × 10²² cm^-2 to limit the dynamics and emphasize low density features. The peak column density is 1.7 × 10²³ cm^-2. Green is the IRAC 4.5 μm image that shows structures due to extinction or emission near the star cluster. Blue is the 2MASS K-band image that shows the young stars. The 7 clumps as described in the text are numbered from 1 to 7 on this image. The two rectangular areas in dashed white lines represent the regions mapped in c) and d). b) Column density map combining Herschel and p-ArTéMiS observations. c) PACS 70-μm emission (colour image and blue contours) with SPIRE 250-μm emission overlaid (in yellow) contours (levels: 10, 20, 30, 40, 50, 60, 70, 80, and 90% of 250 Jy beam^-1 peak emission) for clumps 1 and 2. d) Same as b) but for clumps 3, 4 and 5. Position offsets between 70 and 250 μm emission are clearly observed.