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T(E) = BJD_{TDB}~2,450,018.703604(3) + E \times 0.08786542817(9)  \end{equation}  \noindent  Residuals are shown in Fig.~\ref{Linfit_NEW_Res}. Fig.~\ref{Linfit_NEW_Res} and displays a systematic variation.  The corresponding RMS scatter of the data around the best-fit line is 28.9 seconds. The scatter is ~5 times the average timing error and could be indicative of a systematic process of astrophysical origin. \section{New dataset: Quadratic ephemeris using MPFIT}  We have also considered a quadratic model to the new data set. However, and judged by eye from Fig.~\ref{Linfit_NEW_Res}, there is no obvious upward or downward parabolic trend in the data. Nevertheless we added a quadratic term and generated 10 million initial guesses to find a best-fit model. The resulting reduced $\chi^2$ value increased to 165.7 with 54-3 degrees of freedom. We therefore, decide to not consider a quadratic ephemeris in our further analysis.  \section{New dataset: Linear ephemeris + 1-LTT model using MPFIT}  \section{Figures:}