Accretion history of Auriga halo 27 (resolution level 4) in the space of infall time and peak halo mass. Points represent accreted subhaloes. subhaloes that survive to the present day are marked with a triangle, whilst circles denote those that have been destroyed. Such subhaloes additionally have a line indicating how long they survived after infall. Yellow colouring indicates bright satellites (subhaloes that have contained stars). Different infall groups are presented in different colours, selected by similarity to MW accretion events (see Sect. 3 for details).