Correlation matrix between different parameters for the bright cluster subset. Values were measured for clusters with more than 300 counts to reduce the effect of the statistical errors. Log values were taken for the photon asymmetry, power ratios and centroid shift. We also show the correlation with log cluster luminosity (L₅₀₀), log number of counts in R₅₀₀ (cts₅₀₀), and log redshift.