Timing residuals as a function of orbital phase around superior conjunction, indicated with a solid line for PSR J2055+3829. The best-fit function obtained from the analysis presented in Sect. 3.3 is shown in red. The light red zone shows the RMS of the timing residuals for orbital phases ϕ > 0.5, and the dashed vertical lines correspond to the values of Φ_start and Φ_end as inferred from the fit.