tokens: S.H. was supported by the German Research Foundation (DFG, grant We 1312/37-1), T.R. by the German Aerospace Center (DLR, grant 05 OR 1402). The TMAD service ( http://astro-uni-tuebingen.de/~TMAD ) used to compile atomic data for this paper was constructed as part of the activities of the German Astrophysical Virtual Observatory. Some of the data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. Support for MAST for non-HST data is provided by the NASA Office of Space Science via grant NNX09AF08G and by other grants and contracts. Based on observations made with ESO Telescopes at the La Silla Paranal Observatory under programme ID 093.D-0426. Funding for SDSS-III has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, and the US Department of Energy Office of Science. The SDSS-III web site is http://www.sdss3.org/ . This research made use of the SIMBAD database, operated at CDS, Strasbourg, France, and of NASA’s Astrophysics Data System.
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