Left panel: dips’s arrival time delays versus time. The magenta, blue, black , and green curves are the best-fit curves obtained using the linear+quadratic (LQ), linear+sinusoidal (LS), linear+quadratic+sinusoidal (LQS), and linear+sinusoidal function taking into account a possible eccentricity (LSe), respectively. Right panel: observed minus calculated delays in units of seconds. The residuals, from the top to the bottom, correspond to the LQC, LS, LQS, and LSe function, respectively.