Burst rate of circularly polarised drifting stellar radio bursts that exceed a given spectral energy threshold (erg s⁻¹ Hz⁻¹) based on the spectral type of the star observed. As in Fig. 6, we plot a grey monochromatic region and diverging shaded region, but now only for M dwarfs, as two drifting bursts have been detected from this spectral type. The dashed white line again represents the maximum likelihood of the cumulative luminosity distribution only fitted to M dwarfs, while the blue diverging shaded region shows other possible solutions, with fading colour indicating a lower likelihood. The Poissonian upper limits for other spectral types observed are shown as dashed lines, with triangle markers emphasising their status as upper limits.