Cross-coherence corner-plot between three different simulated observations covering different local sidereal time (LST) ranges. Top panel: Average cross-coherence when DI gain calibrations are applied to the visibilities with a matched PSO sky model. Bottom panel: Average cross-coherence when DI gain calibrations are applied to the visibilities with an mismatched sky model, which is omitting the diffuse Galactic emission. Three regions of the (k_⊥, k_∥)-space are analyzed: The foreground region k_‖ < 0.2 h Mpc⁻¹ (left panel), and two EoR-windows for k_‖ > 0.2 h Mpc⁻¹ and baselines < 100 λ (middle panel), and baselines > 100 λ (right panel). There is on average strong cross-coherence between observations in the foreground region (left panel), whereas weak coherence in the EoR-regions (middle and right panel). There are only minor differences in the average cross-coherence in the EoR-window for baselines < 100 λ, where diffuse Galactic emission is prominent, between calibrating with a matched PSO sky model versus a mismatched one.