Vertical (solid) and longitudinal (dashed) metallicity gradients of the bulge in the model compared to mean metallicities of fields along the minor axis and along the b = 0 axis, from spectroscopic surveys APOGEE DR13, Gaia-ESO survey (GES, Rojas-Arriagada et al. 2014) and the Giraffe Inner Bulge Survey (GIBS, Zoccali et al. 2017).
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