Light curves of the eight FXTs in 0.3–10 keV luminosity units (converted from 0.5–7 keV light curves assuming best-fit spectral models in Sect. 3.3). Several individual transients are overplotted: XRF 080109/SN 2008D (the low-luminosity supernova SBO; solid cyan lines, 27 Mpc); XRF 060218/SN 2006aj (solid blue lines, 145 Mpc); XRF 100316D/SN 2010bh (solid orange lines, 263 Mpc; Barniol Duran et al. 2015; Starling et al. 2011; Modjaz et al. 2009; Evans et al. 2009, 2007; Soderberg et al. 2008; Campana et al. 2006); GRB 110328A or Swift J1644+57 (relativistically beamed TDE; solid black lines, z = 0.3543; Bloom et al. 2011; Levan et al. 2011); J2150−0551 (unbeamed TDE; solid pink line, z = 0.055; Lin et al. 2018). For FXTs 15, 17, 18 and 20 (open symbols), we assume z = 1.0, and for FXTs 16, 19, 21, and 22 we take the redshift values from Table 6.