The wind of the M-type AGB star RT Virginis probed by VLTI/MIDI S. Sacuto, S. Ramstedt, S. Höfner, H. Olofsson, S. Bladh, K. Eriksson, B. Aringer, D. Klotz and M. Maercker A&A, 551 (2013) A72 Published online: 25 February 2013 DOI: 10.1051/0004-6361/201220524