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'the upper boundary' is a correct and usable phrase in written English.
It typically refers to a line that separates two areas or sections and is often used in mathematical or scientific contexts. For example, you could say "The upper boundary of this graph marks the highest point of the data."
Exact(60)
Or it could be as high as 4.5C, the upper boundary of the highest scenario.
The upper boundary of the Calabrian Stage has not been agreed upon universally.
At the upper boundary they are often replaced by sparse juniper forests.
The lower boundary of the Ordovician System indirectly defines the upper boundary of the Cambrian System.
In neither case has a GSSP been agreed upon for the upper boundary of the Calabrian Stage.
The winds are strongest in the tropopause, which is the upper boundary of the troposphere, and move in a generally westerly direction in midlatitudes.
Here, v max is the upper boundary of the velocity.
b Geometries of the upper boundary of the PHS.
The dashed lines show the upper boundary of the BCL.
Blue lines show the upper boundary of the Pacific plate.
But that also happens to be the upper boundary of the volcano's underground magma chamber.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com