Formula of HPLC area

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William Letter

It integrated the area under the peak.

Bruce Levison

The software uses Simpson's rule to integrate the signal from the detector, see links

https://terpconnect.umd.edu/~toh/spectrum/Integration.html#history

http://www.intmath.com/integration/6-simpsons-rule.php

Sangita Shresta

The links are important for understanding signal obtained from LCMS. Thank you sir for posting the link.