Full-sky binned CMB E-mode power spectrum estimated with ABS, for r = 0, and a Gaussian beam of FWHM = 28.3′. The red curve corresponds to the simulated CMB E-mode spectrum, while the green curve is the ABS estimate. The associated 1-σ statistical errors are also shown as a light green shadow region, computed from 50 simulations with independent realizations of the instrumental noise. The lower part of the figure shows the relative error in the estimated power spectrum, , as a percentage. The color and size of the symbols emphasize deviations from 0% error with respect to the input spectrum.