Vertical settling and radial segregation of large dust grains in the circumstellar disk of the Butterfly StarC. Gräfe, S. Wolf, S. Guilloteau, A. Dutrey, K. R. Stapelfeldt, K. M. Pontoppidan and J. SauterA&A, 553 (2013) A69DOI: https://doi.org/10.1051/0004-6361/201220720