How to find area under graph?

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Purush otham on 30 Apr 2018

Commented: Scott MacKenzie on 12 Jun 2021

 How do I find only the area of the shaded portion using trapz, integral or any other method?

Also, is it possible to stop trapz/integral at a particular value. Like only find area like below?

Scott MacKenzie on 12 Jun 2021

Do you have data or equations for the charts above? If so, please post.

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