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. 2008 May 9;95(3):1138–1150. doi: 10.1529/biophysj.107.128207

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(A) Normalized voltage maps of spiral wave anchored to 3.5-mm-diameter hole. (B) Isochrone map. (C) (a) Bipolar pECGs (pV_x and pV_y) for leads placed asymmetrically (solid traces) or symmetrically (shaded traces) around hole, and (b) unipolar pECG (pV₀) for lead offset from (solid trace) or centered on (shaded trace) the hole. (D) pVCG for bipolar leads placed asymmetrically (solid trace) or symmetrically (shaded trace) around the hole. Different colors for the isochrones in panel B correspond to the instants of time shown in panel C.