# bm\_e\_hi

The 1st point on the radiation use efficiency curve is comprised of the ambient CO2 concentration, 330 μL CO2/L air, and the biomass-energy ratio reported for [bm\_e](https://swatplus.gitbook.io/io-docs/introduction-1/databases/plants.plt/untitled-17).

Please read the explanation for parameters [co2\_hi](https://swatplus.gitbook.io/io-docs/introduction-1/databases/plants.plt/co2_hi) and [bm\_e](https://swatplus.gitbook.io/io-docs/introduction-1/databases/plants.plt/untitled-17) to obtain additional information about this parameter and methods used to measure it.