Parameters | Spectral Preprocessing | Alpha

Specify the alpha value for constructing confidence limits at each point in the overlay plot for the mean of the two groups. Confidence equals 1 - alpha /2. The default value is 0.05 , but since the limits are not currently adjusted for multiplicity, you might wish to set alpha considerably lower than this to provide better protection against false positives.
To Specify the Alpha Value:
Enter a value in the Alpha field. The value must be in the range of 0 to 1 , inclusive.