| J | electron transport rate (μmol m−2 s−1) |
| Jv | electron flux required to support Rubisco-limited carbon assimilation (μmol m−2 s−1) |
| Ci | intracellular CO2 (Pa) (see Equation A1 for derivation) |
| Γ* | CO2 compensation point (Pa) |
| ΔJMAX = 30 | maximum amount of electrons that can be supplied from other sources (μmol m−2 s−1) |
| c1 = 0.1765 | share of energy used from excess electron transport (nmol isoprene μmol electron−1) |
| c2 = 0.0028 | basic fraction of energy supply from photosynthesis (nmol isoprene μmol electron−12 |
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