Posterior distribution of parameter duplicates in the Ω_m − S₈ plane for catalogue-level splits for COSEBIs. Left panel: north-South split. Middle panel: red-blue split defined via a cut on the spectral type of T_B = 3.0. Right panel: red-blue split defined via a cut on the spectral type of T_B = 1.9. For reference, the black dashed contours show constraints from the analysis with a single set of parameters modelling both data subsets. The inner and outer contours of the marginalised posteriors correspond to the 68% and 95% credible intervals, respectively.