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OAP upstroke morphology as a function of the direction of transmural propagation (see diagrams below each plot). (A) Propagation away from the recording surface; (B) propagation perpendicular to the recording surface; and (C) propagation toward the recording surface. Open circles on the OAP upstrokes indicate (the Fenton-Karma ionic model) locations of (
)max. Electrical upstrokes are indicated by dashed lines.
