Spiral shock detection on eclipse maps: Simulations and observations E. T. Harlaftis, R. Baptista, L. Morales-Rueda, T. R. Marsh and D. Steeghs A&A, 417 3 (2004) 1063-1074 Published online: 26 March 2004 DOI: 10.1051/0004-6361:20035643