1.2 mm emission (contours) over-plotted on the IRAC [5.8] image of the NGC 6357 complex. The beam size of 1.2 mm emission is 24′′. The red filled circles mark the Flat/class I objects, and the open triangles mark the class II objects. The asterisks indicate known massive stars. The dashed lines depict the inner rims of the three bubbles identified by Churchwell et al. (2007). In regions A and B, the YSO distribution shows arcs centered on the bubble CS 61.