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Figure 7 Integral maps of three subsequent intervals in the atypical atrial Fl cycle recorded in patient 18. The scalar ECG was acquired at the H1 lead site (upper left anterior axillary line) (see Fig. 1 and 4 for further explanation). One may note the spatial reversal in map pattern when comparing the initial with the terminal integral map. This surface map morphology was believed to be associated with a left atrial circuit.