H2O vapor excitation in dusty AGB envelopes - A PACS view of OH 127.8+0.0 R. Lombaert, L. Decin, A. de Koter, J. A. D. L. Blommaert, P. Royer, E. De Beck, B. L. de Vries, T. Khouri and M. Min A&A, 554 (2013) A142 Published online: 18 June 2013 DOI: 10.1051/0004-6361/201218974