FE1
compare
A and FE have a cautionary 
before the upper note of the octave at the beginning of the bar. In the main text, we also give a next to the bottom note. In the remaining sources there is no before the octave – probably resulting from an oversight.
Compare the passage in the sources »
category imprint: Differences between sources; Editorial revisions
issues: Cautionary accidentals
notation: Pitch