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Fig. 2. Scheme of CO2 fluxes into and out of an illuminated leaf provided with 13CO2 in the atmosphere for 1 min. The measurable fluxes of 12CO2 and 13CO2 (E12C, 12CO2 evolution; U13C, gross 13CO2 uptake) outside the leaf and the assumed fluxes inside the leaf (EC, gross 12CO2 evolution; UR, 12CO2 reassimilation) are shown.
