Noise-free 30 GHz TT (top), EE (middle), and TE (bottom) spectra. Shown are the input (black) and the spectra constructed from the a_Xlm coefficients from deconvolution. Deconvolution results are shown for k_max = 4 (purple) and k_max = 6 (red), and for l_max = 400, 500, 600, 700, 800. The best-case results (l_max = 800, k_max = 6) are plotted with a thicker linetype. For comparison we show also the spectrum obtained from harmonic expansion of a naive binned map (green). The spectrum of the binned map decreases rapidly with l because the binning procedure inherently produces a beam-smoothed map. The blue line (TT and EE) is obtained by dividing the latter by the window function of a symmetric Gaussian beam with FWHM = 32′. The TE spectra have been binned over ten multipoles to reduce scatter and to make the plot more readable.