Intrinsic scatter profiles of the thermal pressure distribution in galaxy clusters as a function of normalised radius. Left: Scatter measured in Sayers et al. (2023) and Ghirardini et al. (2019) indicated with black markers. The red and green profiles give the mean and median in bins, respectively, with the error bars indicating the standard deviation and the median absolute deviation. Centre: Best-fitting scatter models of the median bins following Eq. (6) (solid) and Eq. (B.1) (dashed). Right: Scatter measured in Sayers et al. (2023) and Ghirardini et al. (2019) shown with black markers as in the left panel. The blue shaded areas indicate the 16th to 84th percentiles of the intrinsic scatter profile fitted following Eq. (6) in the joint fit to our data in Sect. 5.1. We show the result from the fit to Planck and XMM-Newton data as in Fig. 4, and the hatched area corresponds to the XMM-Newton-only fit. Extrapolated regions for each case are shaded.