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Discordant alternans in homogeneous sheet with structural barrier. (A) Successive APD profiles along the y axis (parallel to the structural barrier) in a homogeneous sheet without (dashed lines) or with a structural barrier (solid lines). The profiles are taken at a distance of 0.6 cm from the edge of the sheet, i.e., in the case of a structural barrier, 0.45 mm from the edge of the barrier. Thick line indicates the position of the barrier. (B) Closeup of APD node in A. BCL = 280 ms.
