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Figure 5 Examples of ventricular tachycardia (VT) morphology (first panel, blue tracing) and pace-maps (red tracing) from the three septal and free wall sites, an unsuccessful ablation site, and a successful ablation site after computer alignment with corresponding mean absolute deviation (MAD) scores below. Note the smaller amplitude in the inferior leads and later precordial transition for free wall compared with septal sites. The unsuccessful ablation site has a reasonable 12-lead "match" and a low MAD score, but not as low as the successful ablation site.