Left panel: 1D line-of-sight stellar surface density profiles of Bashful (red) and Doc (blue), represented by the solid lines. The dashed lines show the exponential fit of their stellar discs, I(R > 1 kpc) = I_dexp(−R/R_d), with a characteristic scale of R_d = (2.07 ± 0.036) kpc for Bashful and R_d = (0.88 ± 0.023) kpc for Doc. Right panel: stellar half-light radius–mass relation of the simulated dwarfs at z = 0. The filled coloured circles represent Bashful (red) and Doc (blue) in our simulation. The empty circles with coloured edges correspond to Bashful (red) and Doc (blue) simulated in Shen et al. (2014), with the blastwave feedback model. The other empty symbols represent satellite galaxies of the Milky Way (diamonds) and Andromeda (squares), from the original sample of Local Group galaxies published by McConnachie (2012).