Median RP spectra calculated for sources in the range between 2350 and 2450 K (top left), 2450 and 2550 K (top right), 2550 and 2650 K (bottom left), and 2650 and 2700 K (bottom right) and assigned to the most prominent BANYAN and HMAC groups. The spectra are ordered in age from the top (youngest) to the bottom (oldest). The median RP spectrum for sources outside the overdensities in each temperature bin is labelled ‘nain sequence’ and is shown in black at the bottom and in light grey superimposed on each group.