The 
mark having been placed in FE almost certainly resulted from the routine approach of the engraver of FE, who moved the mark from above the beam to the side of noteheads – such a placement of marks is generally preferred with only one melodic line on the stave (the first trill in this bar is placed in the same manner, which, however, does not influence its meaning). In the discussed place, this version of notation, suggesting that refers to e
1, must be contrary to Chopin's intention, which is evidenced by the musical sense, confirmed by the version of notation of GE, based on [A]. In FES the mark was crossed out and written over g1; the right text is also in EE.
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category imprint: Differences between sources
issues: Annotations in teaching copies, EE revisions, Errors in FE, Placement of markings, Annotations in FES
notation: Ornaments