Comparison between spectroscopic metallicities reported by Birky et al. (2020) and photometric estimates by our ANN. The 984 stars from the test sample and their corresponding residuals are color-coded by G_BP − G_RP color (darker symbols show cooler stars, and lighter symbols show warmer stars). The solid lines denote the 1:1 relation, and the residuals are zero. In the bottom right corner we represent the histogram of the residuals.