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Gerrit Schellenberger is leading a project whereby the HIFLUGCS cluster sample (REF) is used to examine the effective area cross-calibration uncertainties between Chandra/ ACIS and XMM-Newton/EPIC instruments.
Gerrit's talk in IACHEC 2013 meeting
The project memo from IACHEC 2013 meeting
The project status on April 16 2013