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Figure 3 The reentrant wave front initiated by perpendicular intersection of two wave fronts (data from heart no. 5). Panel A shows that waves "a" and "b" interact at a right angle. The asterisk in panel B indicates the point of wave break. The wave break was then followed by one rotation of counterclockwise reentry (panels B to F). The reentry was terminated owing to collision of wave fronts (arrows in panel F). The myocardial fiber orientation is displayed by the double-headed arrow at the left lower border of the figure.