Fig. 1

Herschel-colour image of NGC 6357: 70 μm (red, resolution 5.9′′) and high-resolution column density (green, resolution 18.2′′). The coordinates are Galactic coordinates. The dashed yellow line outlines the Galactic latitude above which we assume the emission belongs to NGC 6357 and that we used to build the HOBYS catalogue. The cyan and magenta symbols indicate the position of the OB clusters Pismis 24 and AH03J1725-34.4, respectively.
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