Mg I EW versus l.o.s. velocity in the heliocentric system (squares with error bars) for the Sextans, Sculptor, and Fornax dSphs (from left to right). The vertical dotted lines show the region of kinematic membership adopted in previous studies (i.e. with velocities within ± 3σ from the systemic velocity of the dSph for Sextans and Sculptor, and ± 2.5σ for Fornax).
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