Toledo, Catedral - Archivo y Biblioteca Capítulares, 44.2

Many of the differentiae in this manuscript are abbreviated to the "Amen", but the complete differentiae can be inferred from the differentia's mode. See Lila Collamore's dissertation and Rebecca Shaw's thesis. 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.