Cantemus domino gloriose | ~ Ipsum

A noteworthy differentia, as of April '22 only found elsewhere in F-Pnm lat. 1090.
Not even P-BRad Pastas 081, otherwise agreeing on all else with this fragment, reports the two liquescences that make this differentia unique, propending instead for a non-liquescent differentia.

Here and elsewhere in the fragment, 'ipsum' is an indication to repeat the previous psalm verse.