XMM-Newton image of A399 and A401 in the 0.5–2.0 keV band. The yellow box shows the field of view of the Suzaku XIS. Each region is shown in the figure as a red (6′×4′) or white box (2′×8′ or 3′×8′). Magenta circles indicate the virial radius of each cluster. Small cyan circles show the excluded point sources. Gray plus signs represent galaxies with available redshift between 0.07 <z< 0.08 in the NASA/IPAC Extragalactic Database (NED).
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