The average cross-coherence between three different observations covering different local sidereal time (LST) ranges for power spectra obtained from visibilities calibrated with a matched PSO sky model in the left panel, calibrated with a mismatched sky model, that is missing the diffuse Galactic emission component, in the middle panel and the difference between them in the right panel. There is an increase in coherence in (k_⊥, k_∥)-bins corresponding to short baselines |u|< 100, showing that DI-gain calibration errors due to missing Galactic diffuse emission are partly coherent.