Cluster core region of RXCJ1111 including the two brightest galaxies. Left: SDSS r-band image (3′×3′ field) around BCG and BCG2. The white contours correspond to X-ray surface brightness. The black circles indicate the galactic centres, while crosses indicate the X-ray peak positions. Right: residuals obtained after subtracting the best-fit model acquired with GASP2D to BCG SDSS r-band image within a region of 1′×1.4′. The arrows point the northern and southern shells surrounding the core of BCG. Both images are oriented with north up and east to the left.