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Source:
p. 2, b. 24-42
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In A (→FE) there are only 3 flats before the 1st chord – e
2, c2 in the R.H. and a1 in the L.H. In FC and EE1 a 
lowering c1 to c1 and a cautionary one before a were added, while in GE and EE2 a cautionary before e1 was also added.
The necessary lowering c1 to c1 was added in FED.
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category imprint: Interpretations within context; Differences between sources
issues: Annotations in teaching copies, EE revisions, Annotations in FED, Accidentals in different octaves, Cautionary accidentals, Fontana's revisions, Inaccuracies in A, Errors repeated in FE
notation: Pitch
Missing markers on sources:
A, FC, FE1, FE2, FED, FEJ, FES, FESch, GE1, GE2, EE1, EE2, FCI, GE3, EE1a