Comparison of estimated angular power spectra with theoretical power spectra after correction for redshift bin mismatch. Top: average galaxy auto-power spectrum. Bottom: cross-power spectrum reconstructed from 300 realisations of photometric datasets with a modified Lorentzian error distribution, shown for three tomographic bins. The red line represents the theoretical power spectrum corrected for the redshift bin mismatch using Eqs. (24) and (25). The error bars are computed from the covariance matrix of simulations using Eq. (9).