BB angular power spectra from S (first two rows) and S+N (last two rows) residual maps for the HWP setups under consideration. First column: HWP stepped every 1 s (solid black line), 60 s (dotted red line) and 3600 s (dashed blue line), for a telescope scanning at 12 deg/s and 0.7 deg/s. Second column: HWP spinning at 5 Hz (solid black line), 2 Hz (dotted red line) and 0.5 Hz (dashed blue line), for a telescope scanning at 12 deg/s and 0.7 deg/s. The BB spectrum from the input map is shown for comparison in green dot-dashed line (in the S case the spectrum is rescaled down by a factor 104). The assumed noise level corresponds to five days and 18 detectors.
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