Fig. 11
Comparison of the magnitude gap distributions between our X-ray group catalog (XMM-LSS) with the red sequence membership (solid black histogram) and 84 X-ray galaxy groups from the COSMOS+AEGIS+XMM-LSS with the spectroscopic membership (dashed red histogram) and the red sequence membership (dotted blue histogram). The redshift range is 0.05 <z< 1.22. A good agreement is seen between the three distributions, implying that the results obtained with the red sequence selection are robust.
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