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Figure 3 Distribution of bipolar electrical activation (A and B) and repolarization (C and D) intervals measured from eight pigs. Data are shown as mean ± SD. Endo and Epi = subendocardium and subepicardium, respectively. *Apex versus base; Endocardium versus epicardium (p = 0.01 and 0.04, respectively, for apex-endo vs. apex-epi and base-endo vs. base-epi electric activation intervals; p = 0.003 for apex-endo vs. apex-epi repolarization intervals).