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ELVIS contains 48 dark-matter halos of masses similar to the MW or M31 ($\mvir=1.0-2.8\times10^{12}\msun$), with a median $\rvir\approx300\kpc$, the distance where observed dwarf galaxies show a strong transition.  Half of the halos are part of a pair that resemble the masses, distance, and relative velocity of the MW-M31 pair, while the other half are single isolated halos.  We use all 48 halos, given In  the lack absence  of systematic differences in satellite infall times in for  the paired versus isolated halos \citep{Wetzel2015}. \citep{Wetzel2015}, we use all 48 to improve the statistics.  ELVIS identifies dark-matter (sub)halos using the six-dimensional halo finder \textsc{rockstar} \citep{Behroozi2013a} and constructs merger trees using the \textsc{consistent-trees} algorithm \citep{Behroozi2013b}.  For each halo, we assign a virial mass, $\mvir$, and radius, $\rvir$, according to \citet{BryanNorman1998}.