Star-formation rate surface density plotted against galaxy stellar mass, indicating these quantities are moderately correlated (weighted Pearson coefficient of 0.71 for the post-starburst systems). Upper panel: for the four galaxies observed during their starburst phase (see Table 2) are plotted in grey, with the post-starbursts are shown in black (see Table 1). We plot the MACS1149-JD1 in red (this system is observed at a much higher redshift than the others in the sample, but its behaviour appears to be relatively consistent). Lower panel: as above, with the removal of the starbursts to more clearly show the distribution of the post-starburst galaxies.