Differences in atmospheric parameters, as well as the differences in [Fe/H] resulting from two BACCHUS runs, each adopting different values of T_eff and log(g) derived from spectroscopic and photometric parameters. The vertical axis is the difference of each atmospheric parameter and [Fe/H], while the horizontal axis is the ${\mathrm{T}}_{\text{eff}}^{\text{phot}}$. Points are color-coded according to S/N. The mean and standard deviation of the differences is represented in each panel by a black line and a gray shadow. These values for each parameter difference are specified at the lower left part of each panel.