Notes. The mean of the Gaussian priors of the effective temperature (Col. (2)) are the estimates from the Gaia DR3 Gaia General Stellar Parametriser for Spectra (GSP-Spec) catalogue (Gaia Collaboration 2023; Recio-Blanco et al. 2023) that includes measurements from the Gaia Radial Velocity Spectrometer (Cropper et al. 2018). In Col. (3) the uncertainties of the GSP-Spec estimates of the effective temperature were scaled by the factor 3 to generate a broad Gaussian that mimics to some degree an uniform prior. In the same vein, we apply the same scaling for the other columns that give the standard deviations of the Gaussian priors (Cols. (5), (7), and (9)). Similarly, the data in Cols. (4) and (5) were derived from the GSP-Spec catalogue, using the calibration as recommended in Recio-Blanco et al. (2023) (equation 1 with polynomical coefficients in Recio-Blanco et al. 2023) to correct the bias for their estimates. The means and standard deviations of the broad Gaussian priors of [Fe/H] (Cols. (6) and (7)) and [α/Fe] (Cols. (8) and (9)) are based on calibrated values from the GSP-Spec catalogue if available following the recommendations in Recio-Blanco et al. (2023), that is, in case of [M/H] using equation 2 with polynomial coefficients given in second row of table 3 in Recio-Blanco et al. (2023) to calculate [Fe/H] = [Fe/M] + [M/H] and with respect to [α/Fe] using equation 3 with coefficients of the fourth-order polynomial in table 4 in Recio-Blanco et al. (2023) (second [α/Fe] of table 4). For some of the velocity standard stars, no GSP-Spec estimates of [M/H] and/or [α/Fe] were available. For these stars we took the median of all the other means of [Fe/H] and [α/Fe] as the mean of the Gaussian prior and the maximum of the other standard deviation entries regarding the standard deviation of the Gaussian prior. In the last four columns GSPS is used here to refer to estimates from the GSP-Spec catalogue, ‘med’ indicates that for the entry of the mean of the Gaussian prior of [Fe/H] or [α/Fe] we used the median approach as explained above, and ‘max’ labels an entry where we adopted the maximum standard deviation of all Gaussian priors of [Fe/H] or [α/Fe] as also noted above.