Chandra observations of SDSS 2222. Left panel: Chandra image in the soft band (0.5–2.0 keV) of a region of 2.4 × 2.4 arcmin² centred on the BCG of SDSS 2222. The image has been heavily smoothed with a kernel of 6″ following the removal of the six X-ray images of the lensed quasar, readily detected in the 0.5–7 keV band (central panel). The red and blue circles correspond to a radius of 33″ (200 kpc at the cluster redshift) and 70″, respectively. Right panel: HST/ACS F435W image of the cluster core (30″ across) with Chandra contours overlaid in red (0.5–7 keV), showing the six QSO images centred on the peak of the X-ray sources. The three central passive galaxies are relatively faint in the F435W band (arrows).