TT spectrum for horn pair LFI18/23. We show the spectra for devonvolved white and realistic noise. In the case of realistic noise we compare two destriping options: independent and full destriping. The plot is based on 10 Monte Carlo realizations. The lower panel shows the same spectra replotted in dimensionless units to bring out their relative differences; The undeconvolved white noise map spectrum (green) is taken as reference level, and all other spectra are divided by it.