Fig. 1.
Illustration of the derivation of ∇(t⋆, B)ℳ and ∇(t⋆, B)ℒ in the bulge through linear fits (red lines) between RPSF and RB (blue and black vertical dashed lines, respectively) to spline-interpolated stellar age determinations (gray curves) within individual isan (markers). Error bars show the standard deviation about the mean of single-spaxel determinations within each isan.
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