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Weighting functions for bipolar pECGs. The value γx, computed by (A) difference method 
and (B–E) theoretical method. For panels B–E, 
and 
respectively. (F) The value αx, computed by theoretical method is shown on a polar plot, with radial axis ranging from −0.2 to 0.2. For panel F, 
(dashed black trace), 
(solid black trace), 
(dashed shaded trace), and 
(shaded trace).
