Cross-calibrating XMM-Newton's EPIC effective areas for a default empirical correction

Since SAS version 14.0, there is an option available to XMM-Newton users to apply an empirical on-axis effective area correction to reconcile the three EPIC cameras amongst themselves via an energy-dependent multiplicative factor. However, CORRAREA, which is the corresponding extension in the XMM calibration files, is currently only implemented as a non-default tool as it is not yet considered fully validated and requires recalibration. The goal is to make CORRAREA a default correction, for which we perform the necessary data reduction, spectral fitting and analysis, including an automation of the process as far as possible for testing purposes and future updates. This poster introduces the project and shows the current status of the recalibration. Further development of the tool is intended to bring the EPIC cameras in line with instruments on other observatories.