Grain size limits derived from 3.6 μm and 4.5 μm coreshine J. Steinacker, M. Andersen, W.-F. Thi, R. Paladini, M. Juvela, A. Bacmann, V.-M. Pelkonen, L. Pagani, C. Lefèvre, Th. Henning and A. Noriega-Crespo A&A, 582 (2015) A70 Published online: 09 October 2015 DOI: 10.1051/0004-6361/201425434