XMM-Newton  [0.3–2] keV energy band cluster candidate images. North is up and east to the left. The bottom right-hand panel shows the image of the false Planck candidate. For confirmed clusters, image sizes are 3θ₅₀₀ on a side, where θ₅₀₀ is estimated from the M₅₀₀–Y_X relation (Eq. (1)). Images are corrected for surface brightness dimming with z, divided by the emissivity in the energy band, taking into account galactic absorption and instrument response, and scaled according to the self-similar model. The colour table is the same for all clusters, so that the images would be identical if clusters obeyed strict self-similarity. The majority of the objects show evidence for significant morphological disturbance. A yellow cross indicates the Planck position and a red/green plus sign the position of a RASS-BSC/FSC source, respectively.