Standard output from the fitaci function.

An is the net photosynthetic rate, Ci the intercellular CO2 concentration. Symbols are measurements, the black line the fitted FvCB model of photosynthesis. Colored lines indicate the two photosynthesis rates in the FvCB model. In the default mode, the fitaci function estimates Vcmax, Jmax and Rd from the fitted curve. Optionally, Rd is provided as an input, for example when it was measured separately. In this example, Vcmax was estimated as 46.8 (SE 1.47), Jmax was 105.2 (SE 1.36) and Rd was 1.3 (SE 0.24). Assumed parameters were Km = 1460 and Γ* = 64.8 (all in units of μmol m-2 s-1). The R2 of a regression of measured vs. fitted was 0.99.