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Figure 5 A box and whisker plot of the cross correlation between virtual and contact electrograms measured during atrial fibrillation. The box represents the interquartile range and the thick line represents the median value. The whiskers depict the 5th and 95th percentiles. There was a clear deterioration in the level of correlation the further the catheter was away from the center of the array, and points >40 mm were significantly worse than those <40 mm; 0.67 (0.22 to 0.96) versus 0.75 (0.22 to 0.96) (p = 0.01).