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By Y. J. ORSOLINI1∗, H. ESKES2, G. HANSEN1, U.-P. HOPPE3, A. KYLLING1, E. KYRÖ4, J. NOTHOLT5, R. VAN DER A2 and P. VON DER GATHEN6 1Norwegian Institute for Air Research, Kjeller, Norway 2Royal Netherlands Meteorological Institute, De Bilt, the Netherlands 3Norwegian Defence Research Establishment, Kjeller, Norway 4Finnish Meteorological Institute, Sodankyla, Finland 5University of Bremen, Germa...