Residuals of the model fit on the occultation observations. Notice that the occultation observations were taken from the compilation of Maxted et al. (2013), too. x-axis: the index of the occultation observations used for the fit, in order of increasing time (not the cycle number!). y-axis: the residual of the fit in minutes. The meaning of symbols is the same as in Fig. 6. Table A.1 helps to identify the observational point via its index. A small improvement can be seen in the last occultation measurement with the complicated apsidal motion model relative to the simple model.