Corner plot of parameter offsets relative to B19 for the solutions performed (a) without a [Fe/H] prior and (b) with a [Fe/H] prior calculated from the FS catalogue. Two clusters with exceptionally large ∆log(a𝑔e) are marked with green markers and are excluded from the correlation calculation in the plot (a). The dashed lines show linear fits to the data, and the Pearson correlation coefficient r is shown for each pair of parameters. Clusters with unpopulated RGB are shown with an X marker.