SiO emission from low- and high-velocity shocks in Cygnus-X massive dense clumps A. Duarte-Cabral, S. Bontemps, F. Motte, A. Gusdorf, T. Csengeri, N. Schneider and F. Louvet A&A, 570 (2014) A1 Published online: 06 October 2014 DOI: 10.1051/0004-6361/201423677