Dust variations in the diffuse interstellar medium: constraints on Milky Way dust from Planck-HFI observationsN. Ysard, M. Köhler, A. Jones, M.-A. Miville-Deschênes, A. Abergel and L. FanciulloA&A, 577 (2015) A110DOI: https://doi.org/10.1051/0004-6361/201425523