Velocity dispersion as a function of [Mg/Fe] for different metallicities. The velocity dispersions are calculated with bins of 0.08 dex in [α/Fe], but are shown slightly offset above. Globally (black lines), the velocity dispersion increases with [Mg/Fe]. However, for many individual metallicity bins the highest-α populations show a decrease in velocity dispersion relative to the lower-α populations of the same metallicity.
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