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Figure 2 Histogram of the number of arrhythmic episodes that were successfully defibrillated as a function of energy level. Arrhythmic episodes are taken from protocols 2 and 3. It appears that there are two populations of arrhythmias, one that is defibrillated at a relatively low energy level and one that is defibrillated at a much higher energy level. Open bar = reperfusion; solid bar = occlusion. ND = the ventricular fibrillation could not be defibrillated and the animal died.