Fig. 6From: Optimal length of R–R interval segment window for Lorenz plot detection of paroxysmal atrial fibrillation by machine learningRepresentative LP images with a 32 × 32-pixel resolution and a 3-bit brightness level for AF (a, b) and non-AF (c, d) segments with lengths of 50 (a, c) and 500 (b, d) beats. The brightness level reflects the number of points in each pixelBack to article page