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Figure 4 Paired analysis of median duration of atrial fibrilliation (AF) preceeding cardioversion in individuals experiencing successful cardioversion shocks with and without early recurrence of atrial fibrillation (ERAF). The box plot shows the 25th and 75th percentiles. The median value is shown as a line across the box; error bars define the 10th and 90th percentiles. Note variations in graph scaling.