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Figure 5 An example of incomplete rotating circuit (data from heart no. 5). Panel A shows a wave front propagating through the area of conduction block, which is shown in panels B and C. After conduction block occurred, a rotating wave front was initiated (panels D to G) but had spontaneous termination (panels H and I). At the time of termination, the line of block was parallel to the fiber orientation. The myocardial fiber orientation is displayed by the double-headed arrow at the right lower border of the figure.