Left: spatial distribution of X-ray sources detected by XMM-Newton (fields E, C, S and W; full lines) on the AV map (Cambrésy, priv. comm., 2000) with AV = 2.0 and 4.0 mag contours, compared with ROSAT fields from Gregorio-Hetem et al. (2009; dashed lines). Right: mosaic of images of XMM-Newton EPIC PN, MOS 1, and MOS 2 for the same CMa fields combined in three different energy bands. The red, green, and blue filters present the soft band (0.5–1.0 keV), medium band (1.0–2.0 keV), and hard band (2.0–7.3 keV), respectively.
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