In the original Cantus index for this manuscript, differentiae were assigned a two-digit code that identified the last note of each differentiae and used a number to distinguish between differentiae in the same mode that shared the same last note.
Boynton, Susan. Inventory of New York, Columbia University, Rare Book and Manuscript Library, Plimpton MS 041. In: Cantus: A 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: Antiphonal, Plimpton MS 41, Rare Book & Manuscript Library, Columbia University
Standardized manuscript tonary completed by Rebecca Shaw (Dalhousie University) on December 13, 2018. Edited by Jennifer Bain, Sister Ilaria Culshaw, Lucia Denk, and Brayden Olson (Dalhousie University) on September 13, 2019.