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As a test the CURVEFIT routine has been used in a similar manner. The resulting reduced chi2 was also 95.22 matching the result from the previous section. The RMS also agrees with the results obtained from LINFIT. However, the formal $1\sigma$ uncertainties in the best-fit parameters (TZERO and PERIOD) are one magnitude smaller compared to the equivalent values obtained from LINFIT. The data and the best-fit line is shown in Fig.~\ref{linearfit} with the residuals plotted in Fig.~\ref{linearfit_res}.  \section{Linear ephemeris - conclusion}  Afterafter  fitting a straight line and visually inspecting the residual plots I cannot see any convincing trend that should justify a quadratic ephemeris (linear + a quadratic term). What I see is a sinusoidal variation around the best-fit line. Relative to the linear linear the first timing measurement arrives 20s earlier than expected. Then the trend goes down and increases again to 40s at E=0, then decreases again to a minimum to around 20s and increases again thereafter. There is no obvious quadratic trend from looking at the residuals in Fig.~\ref{linearfit_res}.