Fig. 1
The 8 μm emission image of NGC 6357, taken from the GLIMPSE survey (http://www.astro.wisc.edu/sirtf/, Benjamin et al. 2003). The cavity is clearly visible at the centre of the image. G353.2+0.9 is the bright region at its northern border. The location of Pis-24 is also shown in the figure. The coordinates are referred to the epoch J2000.
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