GP model MAP fit to the HD 175607 data. The 110 observations in each time series were fit simultaneously, i.e. using a single set of (hyper)parameters. The dots indicate observed data, with estimated errors; solid lines are model posterior means; and shaded regions denote ± σ posterior uncertainty. Residuals are plotted below the observed data and fitted model, but for the sake of clarity, with an arbitrary vertical offset from the main time series.