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| Chemicals | Volume/Area (μm3 μm−2) | Mean thickness (μm) | Substratum coverage (%) |
|---|---|---|---|
| None | 16.2 ± 2.8 | 16.6 ± 2.3 | 48 ± 6 |
| Clove oil | 0.8 ± 0.2 | 1.0 ± 0.3 | 5 ± 1 |
| Eugenol | 0.09 ± 0.02 | 0.09 ± 0.03 | 0.5 ± 0.1 |
