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Fig. 15

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XMM-Newton/EPIC continuum-subtracted 6.4-keV line intensity contours (linearly spaced between 3 × 10-8 and 1.8 × 10-7 photons cm-2 s-1 arcmin-2) overlaid with an HST/NICMOS map in the H Paschen-α line (Wang et al. 2010; Dong et al. 2011). The axes of the map indicate Galactic coordinates in degrees. The black ellipse and the magenta circle show the two regions used for spectral extraction (see Fig. 10). The red arrow illustrates the observed proper motion of the Arches cluster, which is almost parallel to the Galactic plane (Stolte et al. 2008; Clarkson et al. 2012). North is up and east to the left.

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