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. 2019 Jun 26;10:809. doi: 10.3389/fphys.2019.00809

FIGURE 6.

FIGURE 6

Variation of the mean ApEn value for HRV signals of normal and CAD subjects with varying parameter combinations N and r for (A) m = 2, (B) m = 3, (C) m = 4, and (D) m = 5.