Weighted H-test for PSR J1522–5735 calculated in 90% overlapping 115-day data segments and with the phase model (1) at a fixed ḟ and over a small range in f centred on the pre-glitch value. The vertical axis shows the time midpoint of the data segment. The horizontal axis shows the offset in f from the pre-glitch value. The weighted H-test is shown by the colour bar. The glitch events are noted by the arrows. The dashed blue curve is superimposed to show the timing solution given in Table 1.