Measuring solar active region inflows with local correlation tracking of granulation B. Löptien, A. C. Birch, T. L. Duvall Jr., L. Gizon, B. Proxauf and J. Schou A&A, 606 (2017) A28 Published online: 03 October 2017 DOI: 10.1051/0004-6361/201731064