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b. 44

composition: Op. 10 No 9, Etude in F minor

One  sign in A & GE2 (→GE3GE4)

Two signs in FE (→GE1,EE)

..

Doubled  hairpins in FE (→GE1,EE) may be explained with Chopin's proofreading of an inaccurately arranged mark: at the beginning the engraver arranged  too low, so it seems that it refers to the L.H., which Chopin corrected by adding the 2nd mark over the R.H. The change is of an ad hoc nature, hence in the main text we give the version of A. The correct notation was also guessed in subsequent GE,s. 

category imprint: Differences between sources

issues: Inaccuracies in FE , GE revisions , Authentic corrections of FE

b. 45-48

composition: Op. 10 No 9, Etude in F minor

..

In AI this phrase is not preceded with octaves. Chopin marked their use only from bar 49.

category imprint: Differences between sources; Corrections & alterations

b. 47

composition: Op. 10 No 9, Etude in F minor

..

In this bar in A there is a visible extension of the slur, so it embraced the entire sequence of quavers in bars 46-47 and the minim in bar 48.

category imprint: Source & stylistic information

issues: Corrections in A

b. 48

composition: Op. 10 No 9, Etude in F minor

No marking in AI & A

 in FE (→GE,EE)

..

 was added by Chopin during a proofreading of FE. Similarly in bar 56.

category imprint: Differences between sources

issues: Authentic corrections of FE

b. 48

composition: Op. 10 No 9, Etude in F minor

No mark in AI & FE (→GE,EE)

Long accent in A

Our variant suggestion

category imprint: Differences between sources

issues: Inaccuracies in FE