Relic power vs. cluster redshift. The colour of the points shows the cluster mass. Plusses denote relics which are part of a double relic pair. All other relics are plotted as circles. Red circles surround relics in clusters which also host a RH. The black (dashed) and red (dot-dashed) lines show the estimated detection limit for the median (∼1100 kpc × 200 kpc) and minimum (∼300 kpc × 100 kpc) relic LLSs and widths of our sample, respectively. PSZ2 G069.39+68.05 and PSZ2 G107.10+65.32 are labelled, with the labels directly below the data points.