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. 2019 Feb 11;7:2700107. doi: 10.1109/JTEHM.2019.2898193

FIGURE 9.

FIGURE 9.

Group average z-scored envelope of the average REG signal using two methods Rectify-and-Integrate (envRI) and spline method (envPK) plotted for each sleep stage. Error bars represent standard error of the mean. Inline graphic is the number of 30-sec epochs used to compute the averages.