Ubi duo vel tres congregati fuerint

Two versions of this antiphon are recorded in Iberian sources: one in the fourth mode (either transposed on A or not) and one in the eight. They are very similar and only present minor melodic variations other than the final. That the one in this source, although incomplete and lacking the final, is in the eight mode, can still be inferred by the two neumes d-e just about visible above the trimming. These redirect to some 8-mode differentia (e.g. P-AR Res. Ms. 021, f. 87v melodically matches with this source and has differentia 143b).