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Figure 3 Differences in ventricular captures rates before and after cocaine infusion at the 5 tested positions using varying multiples of standard current strength. These 2 graphs show the mean neuromuscular incapacitating (NMI) output multiples needed to achieve 2:1 (top) and 3:1 (bottom) ventricular capture at Positions A through E. Error bars indicate 1 standard deviation. Higher output multiples were needed after cocaine infusion (blue bars) to achieve the same degree of ventricular capture as during baseline stimulation (red bars).