Timing residuals and median S/N values as a function of orbital phase for PSR J2055+3829. The TOA residuals are shown as red and black dots, with red dots corresponding to observations with S/N values among the 25% lowest. Error bars, which are much smaller than the vertical scale, are not visible in this figure. The blue curve is the median S/N of the TOAs computed over sliding windows of width 0.1 in orbital phase, and the blue zone shows the median absolute deviation around the median values. The dashed vertical line corresponds to superior conjunction, at orbital phase 0.25.