The IRAM-30 m line survey of the Horsehead PDR - IV. Comparative chemistry of H2CO and CH3OH V. V. Guzmán, J. R. Goicoechea, J. Pety, P. Gratier, M. Gerin, E. Roueff, F. Le Petit, J. Le Bourlot and A. Faure A&A, 560 (2013) A73 Published online: 06 December 2013 DOI: 10.1051/0004-6361/201322460