Linear regression of the benchmark-standardized IC index against (a) the unstandardized and (b) the benchmark-standardized Greek EQR values (n = 113 samples). Regression lines and equations represent the relationship of the completed XGIG IC exercise (grey solid line), and the relationships of the unstandardized (black dashed line) and benchmark-standardized (black solid line) STAR_ICMi bs based on the Greek data.