Fig. 4
Top panels: αpoor/αrich ratio as a function of absolute Galactocentric radius (left) and Galactic plane height (right). Bottom panels: 291 stars with fractional distance errors less than 0.6 are shown in blue. The mean [α/Fe] value for each 1 kpc R and Z bin and its error is shown in green in the left and right panels, respectively. A linear fit for these mean [α/Fe] values is shown in red.
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