1. Spectroscopie de l'atmosphère, Chimie Quantique et Photophysique; Université Libre de Bruxelles; Brussels Belgium
2. Cluster Earth and Climate, Department of Earth Sciences; Vrije Universiteit Amsterdam; Amsterdam Netherlands
3. Department of Climate, Air and Sustainability; TNO; Utrecht Netherland
4. Sorbonne Universités, UPMC Univ. Paris 06; Université Versailles St.-Quentin; CNRS/INSU, LATMOS-IPSL; Paris France
5. Louis Bolk Institute; Driebergen Netherlands