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Figure 6 Mean body surface integral maps of CCW (A) and CW typical atrial flutter (B) showing the stereotypical dipolar map patterns during the three successive time periods of the Fl wave cycle in each direction of rotation (see Fig. 1 and 4 for further explanation). Note the high spatial resemblance between the mean intermediate CCW and initial CW Fl wave integral maps as well as the mean initial CCW and terminal CW Fl wave integral maps.