Plik parameter results on 300 simulations for the six baseline cosmological parameters, as well as the FFP8 CIB and Galactic dust amplitudes. The simulations include quite realistic CMB, noise, and foregrounds (see text). The distributions of inferred posterior mean parameters are centred around their input values with the expected scatter. Indeed the dotted red lines show the best-fit Gaussian for each distribution, with a mean shift, Δμ, and a departure Δσ from unit standard deviation given in the legend; both are close to zero. These best fits are thus very close to Gaussian distributions with zero shift and unit variance, which are displayed for reference as black lines. The legend gives the numerical value of Δμ and Δσ, as well as the p-values of a Kolmogorov-Smirnov test of the histograms against a Gaussian distribution shifted from zero by Δμ and with standard deviation shifted from unity by Δσ. This confirms that the distributions are consistent with Gaussian distributions with zero mean and unit standard deviation, with a small offset of the mean.