Constraints on the amplitude of the tSZ and kSZ power spectra at ℓ = 3000, in μK², obtained with SPT high-ℓ data (R21) using either templates (in yellow) or RF-inferred tSZ and kSZ power spectra (in blue), as well as a physical parameterisation of reionisation. Inferences are compared to the initial analysis, with templates and fixed reionisation (in grey). For all cases, the cosmology is fixed (see text for values). On the bottom panel, the kSZ is decomposed into its late-time and patchy components.