Metallicity distribution function (MDF) of APOGEE RC (Bovy et al. 2014) stars (black) within 1 kpc of the Sun compared to Chempy predictions for the default (green) and alternative yield set (red) with Sun+ as observational constraint. The Chempy ISM abundances were weighted with the corresponding SFR and the RC age distribution to obtain synthetic observations. The APOGEE MDF was not used during the fitting procedure.