Correction parameters Δ μ for each anchor GC in the baseline. Blue symbols show the initial values (set to zero; Eq. (11)), and red symbols the fitted values (Eq. (A.10)). Clusters are ordered by increasing distance, so the typical uncertainty in Δ μ grows along the x-axis, although the number of member stars also contributes. Overall, 70% of anchors remain within 1σ of their Gaia parallax values, and all lie within 2σ.