Polarization degree (p), polarized flux (p × Fin arbitrary units), and polarization angle (θ) measured in the V band, through an aperture of 4 pixels of diameter (1″) centered on the nucleus, and in 4 pixel wide annuli of increasing radius (1″≃ 380 pc). The polarization degree is not corrected for the bias. The first bin is circular (nucleus) showing p compatible with zero and an undefined θ.