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Figure 4 Distribution of activation-recovery interval restitution slopes. Maximal restitution slopes are shown in color in the 16 segments of the ventricle in patients 1 to 8. Brown circles = sites of ablation therapy. In patients with idiopathic left ventricular (fascicular) tachycardia (#5 to #7), sites of ablation are located in segments with a restitution slope >1.