Boxplot diagrams of CG properties for groups identified using the classic and the modified algorithm. The notches (waists) in the boxes indicate ∼95 % confidence intervals for the medians, while the widths are proportional to the square roots of the number of objects in each sample (R Core Team 2013). The boxplot diagrams on the left side in each panel are the samples obtained using the classic and the modified algorithms in the mock catalogue (mHC and mHM), while those at the right side show the results for the samples obtained applying both algorithms on the SDSS catalogue (HC and HM).