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Fig. 3

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Maps of the hydrogen column density N(H) derived with the colour temperature maps of Fig. 2. The maps have a resolution of  ~37″ and the contours are drawn at levels where log 10N(H) equals 21.5, 21.8, and 22.1. The circles show the 9 arcmin apertures used in Juvela et al. (2010).

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