In these bars, there are no flats to a
1 and A in A (→FE) (the accidental to a at the end of b. 164 is not necessary due to a respective 
to the L.H. chord). What is more, the remaining necessary flats were inserted only in the first half of each of these bars. Moreover, in A Chopin even deleted the that was initially put to G in b. 165 (cf. the description of A in some Preludes, Op. 28, e.g. in F
minor, No. 8). GE and EE include the version adopted by us.
Compare the passage in the sources»
category imprint: Interpretations within context; Differences between sources
issues: EE revisions, Accidentals in different octaves, GE revisions, Inaccuracies in A, Errors repeated in FE
notation: Pitch