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The basis of the method is the Leiden system of punctuation, see CE 7 (1932) 262–9. It may be summarized as follows:
| α̣β̣γ̣ | The letters are doubtful, either because of damage or because they are otherwise difficult to read |
| ... | Approximately three letters remain unread by the editor |
| [αβγ] | The letters are lost, but restored from a parallel or by conjecture |
| [...] | Approximately three letters are lost |
| ( ) | Round brackets indicate the resolution of an abbreviation or a symbol, e.g. (artabē a dry measure) represents the symbol ⸗̇, stratēgos general/military governor represents the abbreviation στρˢ̅ |
| [[αβγ]] | The letters are deleted in the papyrus |
| `αβγ´ | The letters are added above the line |
| ⟨αβγ⟩ | The letters are added by the editor |
| {αβγ} | The letters are regarded as mistaken and rejected by the editor |
Heavy arabic numerals refer to papyri printed in the volumes of The Oxyrhynchus Papyri.
The abbreviations used are in the main identical with those in J. F. Oates et al., Checklist of Editions of Greek Papyri and Ostraca, 4th edition (BASP Suppl. No. 7, 1992). It is hoped that any new ones will be self-explanatory.