Fig. 3. Histograms and summary statistics of: (a) observed soil CO2 flux, Fco2o; (b) log. of observed soil CO2 flux, ln Fco2o; (c) predicted soil CO2 flux, Fco2p; (d) log. of predicted soil CO2 flux, ln Fco2p; (e) model error,
; and (f) error of the log. of the fluxes,
ln.