Name,unit,variable description
Datetime,---,"date and time, in   ISO 8601:2004(E) format (yyyy-mm-dd hh:mm:ss)"
year,---,The four-digit year
doy,---,Ordinal day of year
hour,---,Hour of the day (0-23.5)
Tair,degC,air temperature
Tair_fqc,---,quality control flag of Tair
Tair_f,degC,gapfilled Tair
RH,%,relative Humidity
VPD,hPa,vapor pressure deficit 
VPD_fqc,---,quality control of vpd
VPD_f,hPa,gap filled vpd
Rg,W m-2,global radiation
Rg_fqc,---,quality control flag of Rg
Rg_f,W m-2,gap filled Rg
PotRad,W m-2,Potential radiation
PPFD,umol m-2 s-1,Photosynthetic Photon Flux Density
Rn,W m-2,Net Radiation
NET_SW,W m-2,Net Short Wave
NET_LW,W m-2,Net Long Wave
Rain,mm,Rainfall
CO2,ppm,co2 mixing ratio
NEE,umol m-2 s-1,Net Ecosystem Exchange
NEE_fqc,---,quality control flag of NEE
NEE_f,umol m-2 s-1,gapfilled Net Ecosystem Exchange
Reco,umol m-2 s-1,Ecosystem respiration estimated after Reichstein et al. (2005)
GPP_f,umol m-2 s-1,Gross Primary Production
GPP_fqc,---,quality control flag of GPP_f 
uStar,m_s-1,Friction velocity
wind_speed,m_s-1,wind speed
wind_dir,degrees,wind direction
LE,W m-2,Latent heat flux
LE_f,W m-2,gapfilled LE
LE_fqc,---,quality control flag of LE_f
H,W m-2,Sensible heat flux
H_f,W m-2,gapfilled H
H_fqc,---,quality control flag of H_f