> For the complete documentation index, see [llms.txt](https://swatplus.gitbook.io/io-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://swatplus.gitbook.io/io-docs/introduction-1/databases/plants.plt/bm_e_hi.md).

# 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](/io-docs/introduction-1/databases/plants.plt/untitled-17.md).

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