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. Author manuscript; available in PMC: 2024 Oct 21.
Published in final edited form as: Nat Methods. 2021 Dec 2;18(12):1524–1531. doi: 10.1038/s41592-021-01331-z

Extended Data Fig. 8 |. Frequency distribution of identified and unknown metabolites detected in a new experimental dataset from samples of the upper human gut intestinal tract.

Extended Data Fig. 8 |

At (normalized entropy)4 > 0.8, identified metabolites are almost absent but spectra of unknown compounds show a rapid increase in frequency due to poor spectral quality.