Face-on (top) and edge-on (bottom) stellar density maps (M_⊙ pc⁻²) of the M 31 and MW analogues in the HESTIA simulations. Disc components of the simulated galaxies have different extensions; however, all the galaxies show a presence of isolated stellar overdensities – dwarf galaxies orbiting around the host galaxies – and many smooth streams, shells, and tidal features contributing to the smooth halo component made of stars that formed ex situ and that accreted at different epochs. Mock HST images, gas distributions and a visualisation of the HESTIA Local Group are presented in Libeskind et al. (2020).