Reprocessing of X-rays in AGN - I. Plane parallel geometry – test of pressure equilibrium A.-M. Dumont, B. Czerny, S. Collin and P. T. Życki A&A, 387 1 (2002) 63-75 Published online: 15 May 2002 DOI: 10.1051/0004-6361:20020368