The line written by Chopin in FEcor was probably supposed to designate 
. It is indicated by the use of exactly this mark in Ap, whose performance markings in the last section of the Etude show a significant concordance with FEcor. However, it is unclear whether Chopin did not finish the mark, as he wanted to waive it, or whether it is a result of distraction (and, e.g., a temporary lack of ink). Therefore, in the main text we suggest a variant solution. The editions do not give this mark. The version of Ap is compatible with the markings of the published version, as far as the substance is concerned (apart from a possibly intentional omission of the mark in bar 45 in FE).
Compare the passage in the sources»
category imprint: Graphic ambiguousness; Differences between sources
issues: Authentic corrections of FE
notation: Articulation, Accents, Hairpins