Comparison of the precision and accuracy of the GWB parameter estimation performed with DR2full (orange) and DR2new (purple). Panel (a): Distribution of the 90%C.I. width of the γ_GWB posterior distribution as a function of the number of frequency bins that are constrained in the freespectrum search. Panel (b): Distribution of the 90%C.I. width of the log₁₀A_GWB posterior distribution as a function of the number of frequency bins that are constrained in the freespectrum search. Panel (c): P-P plot computed with the marginalised posterior distribution of γ_GWB, taking as the true value the standard 13/3. The green diagonal represents the true shape of the P-P plot for a perfectly unbiased recovery, the shaded areas are the 1, 3, and 5σ C.I. given the number of data, which is 100.