Figure 3.

The sector intensity of the fetal breathing movement (FBM) episodes is depicted according to the gestational ages and the episode length. The subfigure (a) refers to the shorter episodes (0.7–0.9 s), (b) to the medium-sized (0.9–1.1 s) ones, and (c) shows the longer episodes (1.1–1.3 s). The lines mark the different gestational ages, where the black dashed line refers to 29–31 weeks, the red circled line means 32–36 weeks, and the blue squared line is between 37 and 39 weeks.