Spatial distribution of blue spectroscopic members, centred on the cluster. Galaxies with spectroscopic redshifts within 2σ of the z = 2.07 peak are shown by blue open circles. The positions of galaxies with z_phot within 2σ of the z = 2.05 peak are shown by red crosses. The orange rectangle shows the field of MOIRCS and the 1, 2, and 3σ significance levels of the extended X-ray emission (as shown on Fig. 1 and discussed in Sect. 5) are drawn at the centre of the plot.