Ascendente Jesu in naviculam ecce

Source: 
Sankt Gallen, Stiftsbibliothek, 390
Folio: 
082
Sequence: 
7
Feast: 
Dom. 5 p. Epiph.
Office/Mass: 
E
Genre: 
A
Position: 
1
Cantus ID: 
001489
Mode: 
?
Differentia: 
?
Manuscript Reading Full Text (standardized spelling): 
Ascendente Jesu in naviculam ecce motus magnus factus est in mari et suscitaverunt eum discipuli ejus dicentes domine salva nos perimus
Manuscript Reading Full Text (MS spelling): 
Ascendente iHcoy in naviculam ecce motus magnus factus est in mari et suscitaverunt eum discipuli eius dicentes domine salva nos perimus
Indexing notes: 
is there an erased differentia here? The mark in the margin is too small to be a differentia code;