Cylindrical power spectra for Cyg A simulations at the locations of NenuFAR and LOFAR, and Vir A simulations at the location of SKA. For each location, the two rows correspond to two phase center declinations (δ₀) of the celestial pole (upper row) and zenith transit (lower row). The different columns correspond to the different LST ranges for which the simulations were repeated. The dotted line is the conventional source line. The black solid lines correspond to the maximum and minimum source lines for the observation duration, obtained from the source line equation derived in this analysis (Eq. (22)). The remaining Cas A and Cen A simulation results are shown in Fig. E.2.