Laitinen, T. [P:(DE-HGF)0] ; Ehn, M. [P:(DE-Juel1)144056] ; Junninen, H. [P:(DE-HGF)0] ; Ruiz-Jimenez, J. [P:(DE-HGF)0] ; Parshintsev, J. [P:(DE-HGF)0] ; Hartonen, K. [P:(DE-HGF)0] ; Riekkola, M.-L. [P:(DE-HGF)0] ; Worsnop, D.R. [P:(DE-HGF)0] ; Kulmala, M. [P:(DE-HGF)0]