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Fig. 4

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Left: the HST-ACS I-band (F814W) image of Mrk 273. Middle: the 0.4–1.1 keV Chandra image of Mrk273, overlaid by the contours obtained from the optical I-band image; Right: the same 0.4–1.1 keV Chandra image as in the middle panel. The X-ray image of 1 arcsec resolution has been smoothed using a circular Gaussian kernel with the dispersion of 1.8 arcsec. The contours for the HST optical image are drawn at 10 logarithmic intervals. In the right panel, a dark lane runs through the soft X-ray nebula in the N-S direction, which coincides with the area where the optical tidal tail is preent. The orientation of the images is north up, east to the left. The scale bar corresponds to 10 arcsec.

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