Impact of GP dimension. Panel a: comparison of the RV amplitude found for each target for four different models, a, f, h, and k. Error bars show the 1σ uncertainty from the MCMC posteriors. Target names are given as TIC IDs with the letter of the planet. Panel b: histogram showing the RMS error of the residuals to the fit. Panel c: histogram showing the RV amplitude found compared to model a. Panel d: histogram showing the RV amplitude found for models h and k compared to model f. Panel e: histogram showing the 1σ uncertainty in the RV amplitude found for the different models.