The 
hairpins were added by Chopin in GC and most probably in the base text to EE. In the main text we reproduce the range of the sign in GC, the versions of the remaining sources are probably (EE) or certainly (GE) inaccurate.
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category imprint: Differences between sources
issues: Inaccuracies in GE, Scope of dynamic hairpins, GE revisions, Authentic corrections in GC
notation: Articulation, Accents, Hairpins