Information on differentia
In the original Cantus index for this manuscript, differentiae are identified by their last note and a number to distinguish between differentiae of the same mode that end on the same note. The same differentiae codes were used in E-Tc 44.1, E-Tc 44.2, and F-Pnm lat. 1090. Where a differentia varies minimally, i.e., in neumation, a lower-case letter was included in the "Extra" field of the original index. This letters are only pertinent to the source in question, not all three sources.
Downey, Charles, and Lila Collamore. Inventory of Paris, Bibliothèque nationale de France - Département des Manuscrits, latin 1090. In: Cantus Manuscript Database for Latin Ecclesiastical Chant: Inventories of Chant Sources. Directed by Debra Lacoste (2011-), Terence Bailey (1997-2010), and Ruth Steiner (1987-1996). Web developer, Jan Kolácek (2011-).
Images: Antiphonarium Massiliense, Latin 1090, Bibliothèque nationale de France, Département des manuscrits