Samples of the posterior distribution of ${\widehat{D}}_{\mathrm{kin}}$ and $\mathrm{\Delta }{\widehat{M}}_{\ast }^2$ coloured by the value of the effective gravitational coupling, μ_∞, in the small-scale limit, k → ∞, for the combination of KiDS-Legacy, Planck 2018 TTTEEE, low-ℓ TT, and low-ℓ EE, DESI DR2 BAO, and eBOSS DR16 RSD datasets. The black contour illustrates the marginalised posterior distribution with the inner and outer contours corresponding to the 68% and 95% credible intervals, respectively. The dashed line shows a fit of the degeneracy for $\mathrm{\Delta }{\mu }_{\infty ,\mathrm{eff}}=\mathrm{\Delta }{\widehat{M}}_{\ast }^2{\widehat{D}}_{\mathrm{kin}}^{\gamma }$ with a best-fit value of γ = −1.220.