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We have analyzed three XMM-Newton observations of the Seyfert 1 galaxy Mrk509, with the goal to detect small variations in the ionized outflowproperties. Such measurements are limited by the quality of thecross-calibration between RGS, the best instrument to characterize thespectrum, and EPIC-pn, the best instrument to characterize the variability. Forall three observations we are able to improve the relative calibration of RGSand pn consistently to 4 %. In all observations we detect three differentoutflow components and, thanks to our accurate cross-calibration we are able todetect small differences in the ionization parameter and column density in thehighest ionized component of the outflow. This constrains the location of thiscomponent of the outflow to within 0.5 pc of the central source. Our method formodeling the relative effective area is not restricted to just this source andcan in principle be extended to other types of sources as well.

The outflow in Mrk 509: A method to calibrate XMM-Newton EPIC-pn and RGS