Rest frame X-ray light curves in common energy range (2−10) keV for all SGRBs in the S-BAT4 extended sample (black lines). The same curves for GRB 211106A and GRB 211227A are highlighted with coloured solid lines. Long GRBs belonging to the BAT6 sample (Melandri et al. 2014) are shown for comparison and they correspond to the grey-shaded area. The consistency of these curves with the S-BAT4 extended sample strengthens their classification as short GRBs.