Activation mapping of counter-clockwise (A) and clockwise (B) cavotricuspid isthmus-dependent macro-reentrant atrial tachycardia. When the WOI setting is from end to end of the P wave (left panel), the early meet late site is equal to the successful ablation site, but not in the case of the conventional WOI setting (right panel). Timing of successful ablation line is right after backward reference of proposed setting for window of interest (arrow in right panel), but it is located in late activation part in the conventional setting for window of interest