Orbital fits for HD 66428 b and c. Top left: Fit of the HD 66428 RV with DPASS. We use fed for Hir94, green for Hir04, and blue for H03. The blue curve shows the best fit. Top right: fit of the HD 66428 RV with DPASS, with the minimum a fixed at 190 au for HD 66428c. The points are the same as on the left. The blue curve shows the best fit. Bottom left: fit of the HD 66428 RV with DPASS, with a stellar RV offset subtracted fixed to 300 m s⁻¹. Black points correspond to the data corrected for the instrumental offsets. The blue curve shows the best fit. Bottom right: fit of the HD 66428 RV using MCMC. The black curve shows the best fit. The colorbar corresponds to the log-likelihood of the fits.