Fig. 5.
Distance of radio halos from the correlation (BCES Y|X method) vs X-ray morphological disturbance (see Sect. 4.3 for details). Green empty circles represent USSRHs or candidate USSRHs, black squares are clusters with RH/R500 ∼ 0.2, and the red square is A1689, which also has RH/R500 ∼ 0.2 and is undergoing a merger along the line of sight (Andersson & Madejski 2004).
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