Values of the observed times of eclipse minima minus the values of those computed with a light time effect with the parameters given in Table 1 plotted as a function of time. The blue O–C symbols correspond to the primary eclipse and the red symbols correspond to secondary eclipse. The symbol size indicates the uncertainty as given in Table A.1. The dashed blue and red lines are possible solutions given by the light time equation. The offset between the solutions is due the time difference by which the secondary minimum lags P/2 in the phased orbit. The dotted yellow lines indicates the O–C trends of the primary and secondary eclipses, corrected for the light time effect.