Total stellar mass vs. stellar velocity dispersion for INSPIRE relics (magenta and red diamonds for extreme and normal, respectively), and non-relics (blue circles). Grey squares are values obtained for normal-sized KiDS galaxies for which SDSS DR16 spectroscopy is available. Magenta triangles are the three confirmed (extreme) relics in the local Universe (F17). For the INSPIRE objects, the R50 velocity dispersion values have to be considered lower limits, because of the effect of the seeing (see Appendix A). The arrow shows the averaged expected variation.