(Left panel) F606W ACS/HST image of the cluster Abell 611 (see Table 3 for the observation summary). The X-ray isophotes derived from the Chandra image (shown in the middle panel) are overlaid in white. The green cross indicates the X-ray centroid. (Middle panel) The Chandra X-ray image of Abell 611 in the energy range [0.25–7.0] keV. The image was smoothed with a 3 pixel FWHM Gaussian filter, and is not exposure-corrected. The contours derived from the HST image (shown in the left panel) are overlaid in white to facilitate the comparison between the images. Here again the green cross marks the X-ray centroid. (Right panel) Pseudo-colour composite image of Abell 611, obtained combining r and g-SLOAN images, taken with the Large Binocular Camera mounted at LBT. The three panels are WCS-aligned; the size of the field of view is  ≃  [1.6 × 1.8]  arcmin.