Extended Data Figure 1: Membership selection.
From: The remnant of a merger between two dwarf galaxies in Andromeda II
The spectroscopic data set in the plane (vlos, R), shaded according to the probability of each target belonging to the stellar population of And II. Non-member targets with velocities higher than the systematic velocity of And II, vsys = −191.4 ± 0.4, are foreground contaminants from the Milky Way, whereas non-member targets at lower negative velocities are interlopers from the Andromeda halo.
