Ratio between the Flagship matter power spectrum measurements and predictions obtained using baccoemu, considering both the nominal cosmology (upper panel) and the fiducial one (bottom panel). In both cases, different colours correspond to a different redshift, as shown in the legend. The grey shaded band mark the intrinsic error of the power spectrum measurements to which an additional 1% contribution has been added to include the error contribution of the emulator, as explained in Sect. 5.1.