Selection and characterization of BGGs in the COSMOS-Web galaxy group catalog. The top and middle panels show histograms of the number of groups as a function of log stellar mass (log₁₀(M_*/M_⊙) and absolute magnitude (M_R), comparing selections based on two different aperture sizes: 250 kpc (blue) and 500 kpc (magenta). The bottom panel displays a scatter plot of absolute magnitude (M_R) versus log stellar mass (log₁₀(M_*/M_⊙), with points color-coded by selection method: mass-selected (blue circles), magnitude-selected (red squares), and hybrid-selected (green triangles). The solid brown, blue dash-dotted, and magenta dashed lines represent the medians for mass-selected, magnitude-selected, and hybrid-selected methods. The shaded regions around the median lines show the corresponding confidence bands.