V-band luminosity versus stellar 1D line-of-sight velocity dispersion of the two simulated dwarfs. The V-band luminosity was computed using the Padova simple stellar populations models (Marigo et al. 2008; Girardi et al. 2010). The filled coloured circles represent Bashful (red) and Doc (blue) in our simulation. The empty circles with coloured edges correspond to Bashful (red), Doc (blue), Dopey (purple) and Grumpy (green) simulated in Shen et al. (2014), with the blastwave feedback model. The empty symbols show the observed L_V − σ relation for satellite galaxies of the Milky Way (diamonds) and Andromeda (squares), from the original sample of Local Group galaxies published by McConnachie (2012).