Page:
Source:
p. 10, b. 257-280
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When interpreted literally, the 
mark in FE falls on a rest. This inaccuracy is most probably a result of a too literal reproduction of the notation of [A], in which Chopin could have not had enough space to write the mark between the bottom stave and the b semiquaver. In the main text, we assume, in accordance with GE and EE, that the mark concerns the beginning of the 2nd beat of the bar. The absence of 
in GE is most probably an oversight.
category imprint: Graphic ambiguousness
issues: Inaccuracies in FE, Errors in GE
notation: Verbal indications
Missing markers on sources:
GE1, GE2, FE1, FED, FEH, FEJ, FES, GE3, EE1, EE2, EE3, Atut, GE2a, FEFo