The noise model in frequency and time domain. Top: Periodogram of the correlated noise model of the best-fit of model I. The peri-odogram shows peaks both at 172 d (red) and the 96 d (blue) signal. Bottom: Comparison between the correlated noise model using draws from the posteriors of the hyperparameters for the dSHO kernel from model I (blue) and the best-fit Keplerian model for the 172 d signal from model E (red). The data points are the offset- and jitter-corrected measurements for all instruments where the contribution from planets b, c, and d have been subtracted.