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On behalf of the International Astronomical Consortium for High EnergyCalibration (IACHEC), we present results from the cross-calibration campaignsin 2012 on 3C 273 and in 2013 on PKS 2155-304 between the then active X-rayobservatories Chandra, NuSTAR, Suzaku, Swift and XMM-Newton. We comparemeasured fluxes between instrument pairs in two energy bands, 1-5 keV and 3-7keV and calculate an average cross-normalization constant for each energyrange. We review known cross-calibration features and provide a series oftables and figures to be used for evaluating cross-normalization constantsobtained from other observations with the above mentioned observatories.

IACHEC Cross-Calibration of Chandra, NuSTAR, Swift, Suzaku, and XMM-Newton with 3C 273 and PKS 2155-304