APOGEE sample of stars within 3 kpc of the Galactic center, chosen to represent the bulge population, compared with our models. The models are normalized to have the same number of stars as the data in the metallicity range [Fe/H] = −1 to +0.5 dex. Thin curve: smoothed model. Thick curve: fiducial model. Upper plot: comparison of the metallicity distributions. Middle plot: comparison of the [α/Fe] distributions. Lower plot: [α/H] distributions.