Fig. 3From: Test-retest reliability of brain arousal regulation as assessed with VIGALL 2.0Scatter plot of slope indices at T1 vs. T2 (N = 27). The horizontal axis illustrated the slope index in T1 while the vertical axis illustrated the slope index in T2. The axis values are represented reversely. Note that nonparametric correlations were calculated due to the ordinal level of the lability score. The linear regression line is presented only for illustration purposeBack to article page