Structure and dynamics of the molecular gas in M 2–9: a follow-up study with ALMA A. Castro-Carrizo, V. Bujarrabal, R. Neri, J. Alcolea, C. Sánchez Contreras, M. Santander-García and L.-A. Nyman A&A, 600 (2017) A4 Published online: 17 March 2017 DOI: 10.1051/0004-6361/201630101