Marginalised one-dimensional constraints as a function of redshift obtained by fitting the measured matter power spectrum with the EFT model (blue) and the baccoemu emulator (orange). Solid lines and shaded bands mark the mean and the standard deviation of the posterior distribution, respectively. For both models, the fit is carried out up to maximum wave mode k_max = 0.25 h Mpc⁻¹, using a Gaussian covariance matrix corresponding to the full box volume of the Flagship I simulation. Dashed lines denote the nominal fiducial values of the parameters {h,ω_c,A_s}. In the bottom panel we show the marginalised constraints on the c₀ EFT counterterm parameter.