On the complex X-ray structure tracing the motion of Geminga A. De Luca, P. A. Caraveo, F. Mattana, A. Pellizzoni and G. F. Bignami A&A, 445 1 (2006) L9-L13 Published online: 13 December 2005 DOI: 10.1051/0004-6361:200500217