Fig. 6

Age distributions of BCGs in different velocity dispersion ranges. Histograms shown by the solid (magenta), dotted (green), dashed (red), and dash-dotted (blue) lines represent the age distribution for BCGs with velocity dispersions in the range of 210 km s-1<σv ≤ 240 km s-1, 240 km s-1<σv ≤ 270 km s-1, 270 km s-1<σv ≤ 300 km s-1, and σv ≥ 300 km s-1, respectively.
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