Table 2 Classes of clusters of ions (complete spectra of thin plate spline and tray-corrected ions, clustered by Spearman’s rank correlation complete linkage hierarchical clustering) annotated for cell wall composition relevance
| Cluster class (EK#) | Number of ions | Annotations |
|---|---|---|
| 0 | 79 | Phenolics, lignin dimers |
| 1 | 103 | Lignin dimers, large mass noise |
| 2 | 40 | Low and moderate mass noise |
| 3 | 32 | Low and high mass noise |
| 4 | 58 | G-lignin |
| 5 | 50 | Carbohydrates |
| 6 | 34 | S-lignin |
| 7 | 25 | Lignin, carbohydrate, and phenolic fragments, moderate mass noise |