| co2_to_ca | CO2 partial pressure |
| dampen_vec | Dampen inputs of rpmodel |
| density_h2o | Density of water |
| ftemp_arrh | Calculates the Arrhenius-type temperature response |
| ftemp_inst_jmax | Calculates the instantaneous temperature response of Jmax |
| ftemp_inst_rd | Calculates the temperature response of dark respiration |
| ftemp_inst_vcmax | Calculates the instantaneous temperature response of Vcmax |
| ftemp_kphio | Calculates the temperature dependence of the quantum yield efficiency |
| gammastar | Calculates the CO2 compensation point |
| kmm | Calculates the Michaelis Menten coefficient for Rubisco-limited photosynthesis |
| patm | Calculates atmospheric pressure |
| rpmodel | Invokes a P-model function call |
| soilmstress | Calculates an empirical soil moisture stress factor |
| viscosity_h2o | Viscosity of water |