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The atomic percentage of certain points determined by EDS analysis.
| Nomination | N | O | Mg | P | Na |
|---|---|---|---|---|---|
| Point 1 | 12.56 | 59.18 | 14.25 | 14.01 | - |
| Point 2 | 12.71 | 59.36 | 14.67 | 13.26 | - |
| Point 3 | - | 76.73 | 12.37 | 10.90 | - |
| Point 4 | 13.02 | 57.51 | 13.84 | 15.63 | - |
| Point 5 | 8.23 | 63.41 | 15.23 | 14.16 | - |
| Point 6 | 5.37 | 64.38 | 3.76 | 6.04 | 20.45 |
| Point 7 | 9.67 | 62.67 | 13.91 | 13.75 | - |
