Residuals from a linear ephemeris derived from the values of T₀ and P_sid given in Table 5 (points) together with the fit to these values from omdot for an eccentric orbit with apsidal motion (solid lines). Secondary eclipse is assumed to occur at phase 0.652 for this plot. Published times of mid-eclipse are plotted using diamond symbols, new times of mid-eclipse are plotted with dots (V-band) or open squares (SAT).