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Average number of matching empirical formulae identified in PubChem at various mass accuracies, averaging over all masses in the present release of the database (mass range 2–9200, median mass 438)
| ppm | 0.01 | 0.02 | 0.05 | 0.08 | 0.1 | 0.2 | 0.5 | 0.8 | 1 | 2 | 5 | 10 | 20 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hits | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.00 | 1.03 | 1.06 | 1.09 | 1.32 | 2.03 | 3.40 | 6.08 |
