Left: RVs and proper motion anomaly: HARPS RVs for HD 206893 (e.g., Grandjean et al. 2019a) along with samples from the posterior for the model fit to the RVs and proper motion anomalies. Right: posterior distributions for our best-fit model of the predicted proper motion anomaly (purple histograms), calculated as the difference between the Gaia EDR3 proper motion, and the long-term proper motion, calculated by comparing Gaia and HIPPARCOS data (labelled “HG” in the figure) and displayed individually in terms of right ascension and declination. The vertical blue lines show the actual values, with 1σ uncertainties represented by the dashed lines.