Left: temperature profile of A2255 in the direction from south to NE. Blue and black crosses indicate the best-fit temperature based on the Center and Relic observations, respectively. The dotted gray lines show the profile of the radio emission taken from the WSRT radio data (Pizzo & de Bruyn 2009). The discrepancy between the Center and Relic observations at r = 7′ is due to the lack of the XIS0 data of the Center observation. Right: radial temperature profile of A2255 in the NE radio relic direction. The gray crosses and the dark gray region indicate the radial profiles obtained by XMM-Newton (Sakelliou & Ponman 2006) and Chandra (Cavagnolo et al. 2009), respectively. Green dashed lines show typical systematic changes in the best-fit values that are due to changes in the CXB intensity and NXB level.