Image centred on the Shapley Supercluster within a redshift range of 0.03 < z < 0.083. White stars indicate known clusters from Proust et al. (2006a). The colour scale represents the galaxy number density, normalised by the median density in each pixel. The outer solid orange contours and inner dashed black contours correspond to Compton y parameter values of 4.4 × 10⁻⁶ and 1.1 × 10⁻⁵, respectively, in the tSZ reconstructed map from the Planck all-sky survey. The outer and inner grey contours correspond to an X-ray signal of 2000 and 10⁴ counts s⁻¹ arcmin⁻², respectively, in the ROSAT all-sky survey map.