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We study the bright Seyfert 1 galaxy Mrk~509 with the Reflection GratingSpectrometers (RGS) of XMM-Newton using the RGS multi-pointing mode ofXMM-Newton for the first time in order to constrain the properties of theoutflow in this object. We want to obtain the most accurate spectral propertiesfrom the 600 ks spectrum of Mrk 509 which has excellent statistical quality. Wederive an accurate relative calibration for the effective area of the RGS,derive an accurate absolute wavelength calibration, improve the method foradding time-dependent spectra and enhance the efficiency of the spectralfitting by two orders of magnitude. We show the major improvement of thespectral data quality due to the use of the new RGS multi-pointing mode ofXMM-Newton. We illustrate the gain in accuracy by showing that with theimproved wavelength calibration the two velocity troughs observed in UV spectraare resolved.

Multiwavelength campaign on Mrk 509. II. Analysis of high-quality Reflection Grating Spectrometer spectra