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Published online by Cambridge University Press: 23 September 2016
The observed infrared properties of dust extinction along the line of site to the Galactic Centre are compared with those in the local interstellar medium. Further constraints on the nature of the dust grains are provided by polarimetric observations, which also lead to information on the stratification of the material along the line of sight. Finally some implications of the large polarized emission seen from the central regions are discussed.