Before the penultimate note in A (→GE1→FE) there is no accidental specifying whether it is to be f
2, in accordance with the figuration's logic, or f2, in accordance with the orthographic rules. In this kind of figures, transferred by an octave, Chopin would often omit repetitions of accidentals, considering them to be obvious. The fact that he heard f2 here is proved by cautionary naturals before the f1-f2 octave in the next bar, added in the proofreading of FE (→EE), most probably by Chopin. In this situation, in the main text we adopt the version with f2. It is also in EE, in which a 
was probably added after having taken into account cautionary naturals (cf. bar 171). GE2 opted for the version with f2, adding a 
before it.
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category imprint: Differences between sources
issues: EE revisions, Accidentals in different octaves, GE revisions, Inaccuracies in A
notation: Pitch