The Spitzer IRAC1 image with superposed X-ray contours and the positions of galaxies with colors and magnitudes compatible with structures at z∼1.2-1.5 (magenta crosses), from the color-magnitude diagram in the (i−IRAC1) vs IRAC1 color–magnitude diagram following Cooke et al. (2015). Blue and brown circles are spectroscopically confirmed members at z = 2.36 and z = 2.24 respectively, blue crosses are MMT spectroscopically followed-up galaxies without measured redshifts.