Proper motions of thermally emitting isolated neutron stars measured with Chandra C. Motch, A. M. Pires, F. Haberl, A. Schwope and V. E. Zavlin A&A, 497 2 (2009) 423-435 Published online: 24 February 2009 DOI: 10.1051/0004-6361/200811052