Fig. 3.

Metallicity of the peak of distribution of metallicities of low-α stars in APOGEE as a function of R for different distance estimates: Gaia (top) and then NMSU, NAOC, and Nice in the next three panels from top to bottom (as indicated, along with the radial gradient estimate, in the legend of each panel). At R < 6 kpc, the gradient is flat in all estimates (inner disk).
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