Left: superposition of the Hα+ [Nii]  map (upper left panel of Fig. 5) of Ciardullo et al. (1988) on the Chandra soft X-ray emission from Bogdán & Gilfanov (2008, see their Fig. 7). The Hα+ [Nii]  map has been smoothed with the same smoothing lengths as those used for the Chandra map (A. Bogdan, priv. comm.). Right: superposition of the A_B extinction on the 8 μm Spitzer-IRAC map after subtraction of a scaled version of the 3.6 μm image(Block et al. 2006). The A_B contours are fixed to 0.05 (blue) and 0.15 (white).