tokens: M. Beuret thanks Arnaud Siebert for providing the shape of the spiral arms from Englmaier et al. (2011) . This research has made use of the VizieR catalogue access tool, CDS, Strasbourg, France. The original description of the VizieR service was published in AAS, 143, 23. This research has also made use of NASA’s Astrophysics Data System Bibliographic Services. Davide Elia’s and Eugenio Schisano’s research activity is supported by the VIALACTEA project, a Collaborative project under Framework Programme 7 of the European Union funded under Contract #607380, that is hereby acknowledged.
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