Magnetic field imprints of the plumes. (a) Field of view covered by both HRI_EUV and HRT data. The background image comes from the HRI_EUV at 17:00 UT. The red (blue) contours of LoS magnetic field with the level of positive (negative) 50 gauss are overplotted. (b), (d) and (f) show the extrapolated magnetic field lines at the location of the three plumes, the sub-regions marked with boxes in (a), (c), (e), and (g) are histograms of frequency of the separation angle between the local magnetic field vector and LoS of three plumes. This separation angle is obtained as an average over all pixels at heights between 2000 and 4000 km along each field line; see the yellow boxes in (b), (d), and (f).