Investigations of the Mars upper atmosphere with ExoMars Trace Gas Orbiter by López-Valverde, MA, Gerard, JC, González-Galindo, F, Vandaele, AC, Thomas, I, Korablev, O, Ignatiev, N, Fedorova, A, Montmessin, F, Määttänen, A, Guilbon, S, Lefevre, F, Patel, MR, Jiménez-Monferrer, S, García-Comas, M, Cardesin, A, Wilson, CF, Clancy, RT, Kleinböhl, A, McCleese, DJ, Kass, DM, Schneider, NM, Chaffin, MS, López-Moreno, JJ, Rodríguez, J