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Figure 4 The distribution of organization indexes (OIs) calculated over a 60-s AF electrogram acquired from all nine animals is displayed in panel A. These data are normally distributed and are representative of the OI values at the time of randomly delivered rapid burst. Panel B shows the distribution of OI values recorded immediately before the burst pace termination attempts synchronized to OI values >0.5. By definition, the distribution curve is truncated at the 0.5 threshold value.