Polarity match percentages between the HMF at 1 AU and the coronal field based on WSO data (r_ss = 3.5 R_⊙, n_max = 9) with T- (blue) and A-sectors (red) defined with the plane division at 1 AU (top panel) or with the radial division in the corona (bottom panel). Rotational values have been smoothed to the running means of 13 rotations. Time of erroneous WSO data is denoted by a dotted line.