Supplemental Figure 2I. Bland-Altman plot for QTc (Framingham) on manually-measured 12-lead ECG vs. 7-lead derived ECG. Solid blue line represents no bias. Solid red line represents mean bias between all measurements. Dashed red line represents ± 2 standard deviations from the mean. Dashed purple line represents ± 3 standard deviations from the mean.