Carbon dioxide, water vapour and energy fluxes from eddy-covariance measurements after post-processing and gap-filling with the REddyProc package (Wutzler, T., et al., 2018) combined with selected environmental variables measured (or derived) at the same site at the EC tower with Campbell Scientific data loggers. Flags describe quality of data after e.g. checks for stationarity and intergral turbulence characteristics (Foken, T. and Wichura, B., 1996), or the ability of gap-filling (Wutzler, T., et al., 2018) and represent either good (0), suspicious (1) or bad (2) data. Net ecosystem exchange of CO2 (NEE) is partitioned into gross primary productivity (GPP) and ecosystem respiration (Reco) by different procedures (Lasslop, et al., 2010, Reichstein et al., 2005). '-9999' is indicating missing values.