Address 21, rue de l'école de médecine 75006 PARIS France TROPECOS members from SU Marie ARNAUDResearch Scientist, IRD Philippe BIRONResearch engineer, Sorbonne Université (Paris) Axel FELBACQAssistant engineer, CNRS Dominique LAMYAssociate Professor Sorbonne Université (Paris) Cornelia RUMPELCNRS research director (Paris)