Example synthetic light curve of case 99 folded over the orbital period. The top panel shows the final eclipse model of the eclipses in red and the full model of the light curve including sinusoids in grey. The orange model is the starting point for the light curve fit. The bottom panel shows the residuals of subtracting the eclipse model (blue) and those of subtracting the full model (orange). The model of sinusoids is also plotted separately in red here. The model starts from an overestimated primary eclipse width, and the fit is unable to fully correct for this as the residuals show. This leads to and underestimated tangential eccentricity by about 0.2 for this case.