Voracious vortexes in cataclysmic variables - A multi-epoch tomographic study of HT Cassiopeia V. V. Neustroev, S. V. Zharikov and N. V. Borisov A&A, 586 (2016) A10 Published online: 19 January 2016 DOI: 10.1051/0004-6361/201526363