Impact of local RFI sources on the cylindrical power spectrum constructed toward the NCP field. The power spectra corresponding to a flat input spectrum are shown in the first two panels from the left. The next two panels show the power spectra corresponding to the estimated RFI spectra. The fifth panel from the left shows the total power from the two simulated RFI sources, and the right-most panel shows the residual data power spectrum after sky model subtraction. The black dashed lines indicate the horizon limit. We note that the noise power spectrum estimated from time-differenced Stokes V data is subtracted from the residual data power spectrum to enable a one-to-one comparison.