Ratio of S residual BB angular power spectra between the cases with and without HWP-induced systematic effects. Top panel: HWP angle miscalibration of amplitude 0.1° RMS (solid line) and 0.01° RMS (dashed line). Middle panel: differential transmittance between the two orthogonal states of amplitude 1%, producing both a Q and U mis-calibration and an intensity leakage modulated at 2fr (solid line), only the former (dotted line), only the latter (dashed line). Bottom panel: generic intensity leakage of amplitude 5% modulated both at 2 and 4fr (solid line), only at 2fr (dotted line), only at 4fr (dashed line). Two HWP configurations are considered: the nominal LSPE-SWIPE stepped setup (black) and a fast spinning design (rotating at 5 Hz with a slow gondola scanning at 0.7 deg/s, in red).
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