Joannes autem cum audisset in

Folio: 
013r
Sequence: 
7
Office/Mass: 
L
Genre: 
A
Position: 
B
Cantus ID: 
003496
Mode: 
1
Differentia: 
G1
Indexing notes: 
the words "Tu es" follow the differentiae (without notation)----what are these? Are they a copying error for the Magnificat chant to follow on the next side?;