X-ray spectral imaging and Doppler mapping of Cassiopeia A R. Willingale, J. A. M. Bleeker, K. J. van der Heyden, J. S. Kaastra and J. Vink A&A, 381 3 (2002) 1039-1048 Published online: 15 January 2002 DOI: 10.1051/0004-6361:20011614