Galactocentric variation of the gas-to-dust ratio and its relation with metallicity A. Giannetti, S. Leurini, C. König, J. S. Urquhart, T. Pillai, J. Brand, J. Kauffmann, F. Wyrowski and K. M. Menten A&A, 606 (2017) L12 Published online: 27 October 2017 DOI: 10.1051/0004-6361/201731728