Post-fit residuals after fitting a timing model to the times of arrival (TOAs) obtained from GBT and MeerKAT data spanning about 19 yr. Each colour represents TOAs obtained from different back-ends of both the telescopes (as shown in the legend). The secondary y-axis also shows the corresponding residuals as a fraction of the rotational spin phase. These residuals are shown for Ter5ao, Ter5ap, Ter5aq, and Ter5as, respectively. The residuals for Ter5ar is depicted here for only 2 yr with phase connection.