The new SZ-discovered Planck objects (red and green symbols) compared to clusters from the ROSAT All-Sky Survey catalogues in the L_X–z plane. The X-ray luminosity is calculated in the  [0.1–2.4] keV band. Catalogues shown are REFLEX (Böhringer et al. 2004), NORAS (Böhringer et al. 2000), BCS (Ebeling et al. 1998), eBCS (Ebeling et al. 2000) and MACS (Ebeling et al. 2007). The solid line is the REFLEX flux limit, the dotted line is the HIFLUCGS flux limit of 2 × 10^-11   ergs^-1cm^-2 and the dashed line is from the MACS flux limits.