Resolving asymmetries along the pulsation cycle of the Mira star X Hydrae X. Haubois, M. Wittkowski, G. Perrin, P. Kervella, A. Mérand, E. Thiébaut, S. T. Ridgway, M. Ireland and M. Scholz A&A, 582 (2015) A71 Published online: 09 October 2015 DOI: 10.1051/0004-6361/201526482