Fig. 10.
Distribution of the 2D stellar mass density of our MUGs, following the parameter 
to define compactness, as in Barro et al. (2013). Overplotted are the values for the confirmed nearby relic galaxies given in Ferré-Mateu et al. (2017). The MUGs in our study span a similar range of density as in relic galaxies, and some even surpass the largest local value of the surface mass density (NGC 1277).
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