Residuals of $\dot{\nu }$ evolution (as calculated for Fig. 7, with the modelled glitch persistent change and exponentially recovering components removed), relative to a linear model with slope $\ddot{\nu }=0.44\times {10}^{-20}$Hz s⁻². The full dataset was divided into three sections of similar length, shown in the three panels (RXTE data in the two superior panels and NICER at the bottom). All plots have equal vertical and horizontal scales. The solid grey lines mark the epochs of the glitches with a detected exponential recovery; dashed lines mark the epochs of glitches with Δν > 19 μHz; and thin dotted lines represent the epochs of smaller glitches. Glitch numbers are indicated at top of each panel.