Measured proper motion anomalies (|Δμ|) from hydrodynamical simulations describing the effect of protoplanetary disc gravity on Gaia DR2-DR3 and Hipparcos-Gaia DR3 |Δμ| (see Brandt 2021; Kervella et al. 2022 for the latter). We consider a 1 M_⊙ central star at 150 pc. Mass of the simulated companion and disc are shown in the legend of each plot. Vertical grey lines are Hipparcos-Gaia and Gaia DR2-Gaia DR3 time baselines. The effect of the disc on the measured proper motion anomaly is at most ∼10% for very massive discs (M_d ∼0.1 M_*) across different mass ratios (q).