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Poincaré plot of RRn+m vs. RRn from HRV analyses of one diabetic (D, left panels) and one nondiabetic subject (ND, right panels). In the upper panel, the lag factor m = 1, in the middle panel, m = 5, and in the bottom panel, m = 9. Note the greater scatter in the ND subjects, particularly as the lag factor is increased.
