Stokes Q and U and polarized intensity images for the ten filters. The left and right parts correspond to the data before and after Q_ϕ and U_ϕ minimizations, respectively. Red and blue circles represent the photospheric radius (22 mas; Montargès et al. 2016) and the position of the IDS in H2019 (32 mas), respectively. On the polarized intensity map, angles of polarization are marked as orange segments. North is up, and east is to the left. Units are W m⁻² sr⁻¹.