Figure 4
From: Is there evidence of fetal-maternal heart rate synchronization?
Phase of synchronization epochs. Number of synchronization epochs (SE) found over all subjects in specific phases for the combinations 3:2, 4:3, 5:3 and 4:7 in both the real and surrogate data sets. Note the presence of peaks and troughs in the real 5:3 and 7:4 combinations (5 and 7 peaks, respectively), not obvious in the surrogate combinations.