Fig. 1
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Example of group infall in halo 27 of the level-4 AURIGA simulations (made with Pynbody; Pontzen et al. 2013). We define group infall as companion satellites within the R200 of the primary satellites when the primary satellite first touches the central MW-like host galaxy (see Sect. 2 for details). This group is plotted at the snapshot immediately after primary infall.
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