The heterogeneous coma of comet 67P/Churyumov-Gerasimenko as seen by ROSINA: H 2 O, CO 2, and CO from September 2014 to February 2016 - Hoang, M; Altwegg, K; Balsiger, H; Beth, A; Bieler, A; Calmonte, U; Combi, MR; De, Keyser J; Fiethe, B; Fougere, N; Fuselier, SA; Galli, A; et al. (Astronomy and Astrophysics, 2017)