in 
The accent in AF is quite short in this bar, hence it is its shape and context that make us consider it a long accent. The presence of a significantly longer mark in FE (→EE) – such as in analogous b. 17 – points to a possible intervention of a reviser or perhaps Chopin himself. A change performed on Chopin's order would confirm the mark to be a long accent. The mark in GE1 was placed inaccurately, so it is not entirely certain which beat of the bar it concerns.
Compare the passage in the sources »
category imprint: Differences between sources
issues: Long accents, Inaccuracies in FE, Authentic corrections of FE
notation: Articulation, Accents, Hairpins