Figure 4
From: Atrial fibrillation detection by heart rate variability in Poincare plot
First typical Poincaré plot from non-AFib ECG data. (a) The 20 second amount of ECG data from 'n01', CinC 2001. The inter-beat intervals are uniform. The mark O means the QRS detector found the time position of the ventricular activity. (b) The Poincaré plot from the left ECG data. The points gather around one point on the diagonal line. This means the inter-beat intervals are almost same.