In FE (→EE1), there are no cautionary naturals before c3 in bar 558 and a2 in bar 560. The accidentals were added in GE and EE2 (before a2) and EE3 (both). In turn, in all sources, there is a cautionary 
before c2 at the beginning of bar 559, which we omit in the main text.
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category imprint: Differences between sources; Editorial revisions
issues: EE revisions, GE revisions, Cautionary accidentals
notation: Pitch