Boxplot of mean q value shows from left to right: GBM gross tumor (G1), peritumoral edema (G2) and margin (G3), and adjacent NAWM (G4); metastases gross tumor (M1), peritumoral edema (M2) and margin (M3), and adjacent NAWM (M4); and normal brain compiled from all regions (N). Also shown are outliers: mild outliers represented by a circle and extreme outliers, by an asterisk.