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The objective of this step is to identify and quantify the features present in the spectra. Peak-based methods are the most common algorithmic choice for featuredetection in MS-based studies, to detect the peaks across the spectrum and integrate their areas to provide a quantification of the underlying metabolite.
(Lazar et al., 2015) Bioinformatics Tools for Metabolomic Data Processing and Analysis Using Untargeted Liquid Chromatography Coupled With Mass Spectrometry. Bulletin UASVM Animal Science and Biotechnologies 72(2) / 2015.