Figure 3. Signal-to-noise ratio comparison. Values of the signal-to-noise coefficient for both measurements of opioid EEG effect. Every black dot represents a person. The lines connect the value for spectral edge and the canonical univariate parameter in each subject. The small arrows note the median value. The top panel combines the results for all opioids. The lower panels show the results with each opioid individually. Dots overlap where two lines appear to connect to the same dot.