LX − Tvir relation for the HIFLUGCS sample of clusters. The filled symbols represent clusters with a central radio source and the open symbols represent those without. The squares (blue), circles (green), and triangles (red) represent strong cool-core clusters (tcool < 1 Gyr), weak cool-core clusters (1 Gyr < tcool < 7.7 Gyr), and non-cool-core clusters (tcool > 7.7 Gyr), respectively.
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