Throughout this manuscript, differentiae for antiphons are given in the margins, apparently in the original hands. These are often accompanied by modal designations in lower-case Roman numerals, also in the original hands. When the mode is not indicated, it can be determined if the exact neume forms of the differentia are given an explicit modal designation elsewhere in the manuscript. In such cases and others in which the mode is evident, but not given explicitly for the particular chant, the mode number is entered into the mode field, but followed by a question mark. If there is any ambiguity, a mode has not been assigned. Differentiae are numbered for each mode in no particular order. There is a series of differentiae for antiphons whose modes cannot be determined. These are characterized by having only a question mark in the mode column. Modes for responsories are provisional; they are based on the neume forms of the eight verse tones and comparison with the other sources in the database. Because of their provisional nature, all mode numbers for responsories are followed by a question mark. Again, if there is any ambiguity (such as in cases where a non-standard tone is given for a verse), a mode has not been assigned.