A natural before the bottom note of the 1st bottom R.H. voice quaver (e1) is present only in EE, the only one in which this patent inadvertence of Chopin was corrected. Similarly, the 
before the bottom note of the 2nd L.H. quaver (b), overlooked in A (→FE,FC→GE), was supplemented only in EE. As far as FCI is concerned, it is difficult to decipher the accidentals here based on the photocopy available to us – it seems that out of 3 necessary accidentals, the top one was overlooked, raising a
1 to a1.
Compare the passage in the sources»
category imprint: Interpretations within context; Differences between sources
issues: EE revisions, Accidentals in different octaves, Omission of current key accidentals, Inaccuracies in A, Errors repeated in GE, Errors repeated in FE
notation: Pitch