L − E_p contours for our sub-sample of Fermi/GBM SGRBs detected also by Swift/BAT with a 64 ms peak flux p_{[15 − 150]} > 3.5 cm⁻² s⁻¹ (see the main text for the full sample selection criteria). The main panel shows the contours that contain 50% (thick lines) and 90% (thin lines) of the posterior probability on (L, E_p) for bursts with a spectroscopically measured redshift, plus GRB 170817A (which does not belong to the GBM+BAT sample); the right-hand inset shows the corresponding contours for four events with a photometric redshift measurement (from Fong et al. 2022); the left-hand inset shows the contours for the remaining two SGRBs with an unknown redshift, constructed assuming a uniform prior on z in the range (10⁻⁴, 4). These two events were not included in the analysis.