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The current atmospheric measurement network from the Center for Isotope Research (CIO) of the University of Groningen consists of two sites (LUT,F3) for in situ and four sites (LUT,F3,JFJ,MHD) for flask-sampling measurements (see the locations in Fig.1 and the site information in the caption).At the LUT tower site.in situ measurements of major greenhouse gases (CO2,CH4,N2O) and related tracers (CO,SF6,222Radon) have been made,and the F3 North Sea platform monitoring station is equipped with in situ measurements of δO2/N2 and CO2.