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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`) is only useful when reported in conjunction with other photosynthetic data, such as `Amax`.   Specifically, if we have `Amax` and `gs`, then estimation of `Vcmax` only covaries with `dark_respiration_factor` and atmospheric CO2 concentration.   We also now have information to help constrain `stomatal_slope`. If we have Amax `Amax`  but not gs, `gs`,  then our estimate of `Vcmax` will covary with: `dark_respiration_factor`, `CO2`, `stomatal_slope`, `cuticular_conductance`, and vapor-pressure deficit `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` and `stomatal_slope`.