Difference between the derived and the injected parameters for the Earth-size planet. Shown are the G1 model (in green) and the best GP noise model (in red). The dotted line shows the value of the injected planet-to-star radius ratio (implying that a depth measurement 3σ away from this line is consistent with a depth of zero and is therefore not significant). The unit of time is hours, and not seconds as for the larger planets. The true value is shown as a dashed line.