Fig. 2
Left: raw smoothed X-ray image of the Sextet and its surrounding region with point sources subtracted. Right: B+R image of HCG 79 with its optical luminous halo adapted from D08. X-ray contours of the pure diffuse hot emission are superimposed on the optical image; the contours are logarithmically spaced and the first is displayed at 0.21 × 10-5 ct s-1 pix-1.
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