Illustrating the efficiency of the partitioning algorithm (k-means) in CBG clusters. The RPs in the Ca II K, Ca II 8542 Å, and Fe I 6173 Å lines are shown using solid blue, maroon, and red lines, respectively. The dashed lines mark the zero position in the wavelength axis. The density distribution plots of the Ca II K spectra for four RPs classified as CBG RPs are shown in blue. The density (darker meaning a higher concentration of spectra) corresponding to each Ca II K RP shows the distribution of profiles over the entire time series. The percentage of profiles out of the whole data set belonging to a particular cluster is denoted as n.