Spiritus sanctus superveniet in te

Folio: 
137r
Sequence: 
3
Office/Mass: 
V
Genre: 
A
Position: 
M
Cantus ID: 
006156a
Mode: 
8
Differentia-Old: 
M
Manuscript Reading Full Text (standardized spelling): 
Spiritus sanctus superveniet in te et virtus altissimi obumbrabit tibi alleluia
Indexing notes: 
Luke 1:35 text straight from the Vulgate. Should it be 006156a or 006156b?