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\subsection{Quadratic ephemeris using CURVEFIT}  The results from CURVEFIT are surprising. The best-fit $\chi^2$ value was 3718.89 yielding a reduced $\chi^2$ of 95.36 with (42-3 DoF). The RMS scatter of the residuals around the quadratic model fit was 31 seconds. This means that the fit became worse compared to a linear ephemeris model. The resulting residual plot is shown in Fig.~\ref{quadfit_res}. The corresponding best-fit parameters for a quadratic ephemeris is  \begin{eqnarray}  T(E)&=&T + P\timesE P \times E  + A\timesE^2 A \times E^2  &=& emc^2  \end{eqnarray}