(Chair: Eric Miller).
Aims to use clusters of galaxies as cross-calibration standards, using a systematic comparison of X-ray spectroscopy results obtained with all recent and current major X-ray missions.
Current members: A.Beardmore, M.Bonamente, Y.Chen, Y.-P.Chen, L.David, J.de Plaa, K.Forster, C.Grant, K.Kettula, S.Jia, C.Li, K.Madsen, H.Matsumoto, N.Ota, A.Read, G.Schellenberger, S.Snowden, M.Stuhlinger, S.Suchy, C.Tenzer, Y.Wang, I.Valtchanov N-J.Westergaard, H.Zhao