Upper panel: Correlation plot of C₊₁ and I_Simean for three types of CBs. Middle panel: Correlation plot of C_L and I_Simean. With black circle edges, we mark CBs related to UV bursts, and with yellow possible EBs (more in Sect. 7). For the first two plots, colors of points refer to three types of CBs. Bottom panel: Correlation plot of ratio, R (C₂₈₀₀/C_L, which relates to the atmosphere formation height (Fig. 4) and I_Cmean. Colors on this plot represent values of logarithm of the I_Simean, according to color bar on the right side. Two vertical lines indicate the edges between three types of CBs (defined by C₂₈₀₀/C_L), which are marked with the numbers “1,” “2,” and “3” at the top of the plot.