Pulse profiles (0.5–8.0 keV) of all NICER observations where significant pulsations were detectable. The labels within each panel denote the last three digits of the NICER obsid number, i.e. 4202430XXX. All profiles are normalised to the average intensity, and the minimum is shifted to zero phase. Shaded horizontal regions denote the limit of the statistically significant variability above the constant level hypothesis. For comparison, the 2016 pulse profile as measured by Chandra is plotted with a dotted grey line in each panel.