Left panel: radial acceleration relation (RAR) at 2 kpc (see text) with L18a parameters. The six representative galaxies plotted in Fig. 6 are displayed as green, magenta, and orange squares and stars in this plot. The grey dotted line is the 1:1 line. The red dashed curve is the RAR from Eq. (7). UGC 7690 and NGC 024 fall particularly well on the relation. Also overplotted as cyan triangles are the points of the RAR at 2 kpc from the NIHAO simulations of Dutton et al. (in prep.). Right panel: diversity plot: circular velocity at 2 kpc from the centre Vrot(2 kpc) vs. circular velocity at the last observed point VRlast for the same galaxies. The cyan triangles are the predictions of the NIHAO simulations from Fig. 2 in Santos-Santos et al. (2018). UGC 7690 and NGC 024 appear to have too high velocities Vrot(2 kpc) and hence too high central DM concentrations (n = 5.5 and 4.7, respectively) compared to simulations with very efficient core formation.
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