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**Table \ref{tab:covariates}: Traits with required covariates** \label{tab:covariates}   A list of traits and the covariates that must be recorded along with the trait value in order to be converted to a constant scale from across studies.*notes:* stomatal conductance (gs) (`gs`)  is only useful when reported in conjunction with other photosynthetic data, such as Amax. `Amax`.  Specifically, if we have Amax `Amax`  and gs, `gs`,  then estimation of Vcmax `Vcmax`  only covaries with dark_respiration_factor `dark_respiration_factor`  and atmospheric CO2 concentration. We also now have information to help constrain stomatal\_slope. `stomatal_slope`.  If we have Amax but not gs, then our estimate of Vcmax `Vcmax`  will covary with: dark_respiration_factor, CO2, stomatal_slope, cuticular_conductance, `dark_respiration_factor`, `CO2`, `stomatal_slope`, `cuticular_conductance`,  and vapor-pressure deficit VPD `VPD`  (which is more difficult to estimate than CO2, but still possible given lat, lon, and date). Most important, there will be a strong covariance between Vcmax `Vcmax`  and stomatal_slope. `stomatal_slope`.  | Variable | Required Covariates | Optional Covariates |