Fig. 4
The RM of the 30 sources observed within 2° from the center of A2255. Each circle is centered on the location of a source and its area is proportional to the RM value. In the legend, a scale factor is also shown. The gray circle indicates the X-ray boundaries of A2255 as derived from the ROSAT PSPC observation of the cluster in the 0.5–2.0 keV band (Miller & Owen 2003).
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