FE1
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No 
in GC (→GE) is almost certainly an oversight of the copyist, who apparently forgot to write dynamic indications between the staves in the entire line of the manuscript (bars 7-15 – cf. bars 8, 9-10, 11-12 and 12). It is a relatively frequent type of mistake, resulting from the logically ordered, gradual organisation of the writing process.
Compare the passage in the sources »
category imprint: Differences between sources
issues: Errors of GC
notation: Articulation, Accents, Hairpins