Fraction of counter-rotating stars (shown in blue) for four dissipationless retrograde mergers. Stars are divided into four regions, according to their height above (or below) the galaxy midplane: (1) at |z| ≤ 1 kpc; (2) at 1 kpc ≤ |z| ≤ 3 kpc; (3) at 3 kpc ≤ |z| ≤ 5 kpc; and (4) at 5 kpc ≤ |z| ≤ 10 kpc. For each region the fraction of satellite stars to the total number of stars is also shown (gray).
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