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Fig. 1

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3° × 3° 21.3 μm (MSX band E) image of the H ii  region NGC 6357 (containing the star clusters Pismis 24 and AH03 J1725 − 34.4) and its environments. The positions of seven bow shocks detected with MSX and Spitzer are marked by large and small circles, respectively. The position of the two most massive stars in Pismis 24 (which define the centre of the cluster) is indicated by a large diamond. The position of the most massive star in the cluster AH03 J1725 − 34.4 is marked by a small diamond. The position of IRAS 17207 − 3404 is indicated by a square, while the positions of three circular shells are indicated by crosses (see text for details).

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