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\section{Linear ephemeris - fitting a straight line}  In general I am using IDL for the timing analysis. The cycle or ephemeris numbers have been obtained from IDL> ROUND((BJDMIN-TZERO)/PERIOD) where BJDMIN are all 42 timing measurements, TZERO is an arbitrary timing measurement that defines the CYCLE=0 and PERIOD is the binary orbital period (0.087865425 days) and was taken from \cite{Potter_2011}, Table 2. As a first step I used IDL's LINFIT code to fit a straight line with the MEASURE\_ERROR keyword set to an array holding the timing measurements errors (Table 2, 3rd column, Potter et al. 2011). The resulting reduced $\chi^2$ value was 95.22 with the ephemeris (or computed timings) given as  \begin{equation}  T(E) = BJD 2450021.77890(59) $\textnormal{BJD}$~2450021.77890(59)  + E \times 0.0878654291(1) \end{equation} 
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