Distributions of parameter differences, normalised with respect to the reported GSP-Spec and literature uncertainties. From left to right: T_eff, log(g), and [M/H] differences. From up to bottom: Differences with respect to RAVE-DR6, GALAH-DR3, and APOGEE-DR17. Dotted histograms correspond to the same distributions inflating the uncertainties (GSP-Spec and literature) by a factor of 4. The red curve shows a normal distribution of unit dispersion and zero mean. An unbiased parameter estimation with correct uncertainties should follow this distribution.