GP model MAP fit to system 2 for which team 2 could recover accurately two of the four injected planetary signals. As in other data sets, the crude pre-processing pipeline used by team 2 wrongly removed signals longer than a couple of months, therefore removing the signal of the 75-day planet present in the data. All plotted time series were fitted simultaneously, using a single set of GP hyperparameters. The green dots indicate the raw time series; the solid lines are model posterior means, and the shaded regions denote ± σ posterior uncertainty. The blue dots indicate model residuals. A zoom on the fourth epoch of observation can be seen in Fig. 3.