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The number of carbon atoms in the peptide molecules and relative packing density with respect to peptides. The packing densities were calculated by C1s intensity and divided by the number of carbon atoms in the molecules.
| Peptide-SAMs | Number of carbon atoms in the peptide molecules | C1s intensity/the number of carbon atoms in the molecules |
|---|---|---|
| EK SAMs | 61 | 32.0 |
| DK SAMs | 57 | 35.5 |
| ER SAMs | 61 | 31.6 |
| DR SAMs | 57 | 36.3 |
