Cumulative distribution functions (CDFs) for the GCNS background distribution (dashed blue), the GCNS × X-ray flare distribution (solid blue) according to the study by Johnstone et al. (2021) , the V-LoTSS × GCNS sample (green), the LoTSS × GCNS sample (orange), and the VLASS × GCNS sample (grey), shown as a function of stellar mass in units of solar mass M_⊙. The shaded regions correspond to the 95% confidence level based on a binomial distribution. Johnstone et al. (2021) only consider stars of stellar mass between 0.1 and 1.2 M_⊙, and so we exclude stars with less than 0.1 M_⊙ (around spectral type M6) from this specific analysis. The top axis of the CDF plots indicates the nominal stellar spectral types (Pecaut & Mamajek 2013).