Comparison between parameters obtained with different methods. Top panels: differences between the photometric and spectroscopic parameters. Bottom panels: differences between the machine-learning and the spectroscopic parameters. Left panels: case of T_eff, the middle ones of logg, and the right ones of [Fe/H]. The median difference and MAD are written in each panel. The horizontal lines mark the zero (perfect agreement), ±100 K (for T_eff), and ±0.2 dex differences (for logg and [Fe/H]), respectively. See Sect. 4.5 for more details.