N49. Top left: Spitzer-GLIMPSE 8.0 μm emission in turquoise and 24 μm emission in red. Others: contours of 870 μm emission superimposed to greyscale images at 8.0 μm, 870 μm, 20-cm, and 24 μm; the 870 μm contour levels are 0.08 Jy/beam (used to define the limits of the collected shell), 0.25, 0.5, 1.0, and 2.0 Jy/beam. The red contours at 0.25 Jy/beam have been used to measure the integrated 870 μm flux of condensations 1 to 4. The green crosses indicate the NH₃ positions measured by Wyrowski & Wienen (in preparation; Table A.2). The massive stage I YSOs found by Watson et al. (2008) are indicated.