Total S/N per half-decade, , with (ℓ_min, ℓ_max) in [3, 10[ (top row), [10, 33[ (second row), [33, 100[ (third row), and [100, 333[ (bottom row), as a function of the smearing angle for the AC signal, the XC signal with both normal and optimal weights, and their combination, AC+XC (leftmost, central, and rightmost panel, respectively, in each row). Different colours refer to different energy cuts, and the horizontal dashed line shows the thresholds for 3σ detection.