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\section{Timing data}  The data has been taken from \cite{Potter_2011}. All timing stamps are in BJD using the TDB time scale. No further transformations needed. A total of 42 timing measurements exist. exist and have been taken from Table 1 in \cite{Potter_2011}.  However, Potter et al. have discarded data points. points with too large uncertainties.  See their text for details. In this analysis I will consider the full set of timings as a start. Later the analysis chain can be repeated with any discarded timing measurements. (Table 1 in Potter 2011).  \section{Linear ephemeris - fitting a straight line}  In general I am using IDL for the timing analysis. As a first step I used IDL's LINFIT code to fit a straight line. However, the returned $\chi^2$ value did not make sense.