Time of arrival residuals obtained with our set of ToAs and the timing solution in Table 2. The early ToAs (in blue) were obtained with the Arecibo observing setup; the latter (in red) were obtained with the FAST observing setup. The top plot shows the residuals as a function of time and the lower plot shows them as a function of orbital phase relative to ascending node. No trends are visible in the residuals, which means that the timing solution in Table 2 provides a good description of the data. Furthermore, no eclipses are seen at superior conjunction, which occurs at an orbital phase of 0.25.