Added si bémol to fit the typical melody used in other 5th mode RR/, however, to be reviewed in light of the altera pars beginning on si.
Melody and rsigns from LH83, unchanged in 2019, but lowered by a tone, to fit the mode and the V/ tone. This is in conformity with some MSS: LAT12044, Tol. 44.2, Klostemburg 1018, etc.
Source of neumes is SG387
Gained one line by removing altera pars incipit