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b. 51

composition: Op. 25 No 5, Etude in E minor

Quaver in FC (→GE) & EE

Crotchet in FE

..

The fact of extending the sound of the f1 note can be a Chopin improvement introduced in the base text or proofreading of FE.

category imprint: Differences between sources

issues: Authentic corrections of FE

b. 51

composition: Op. 25 No 5, Etude in E minor

..

FE has an erroneous g2 instead of fas the top note of the penultimate quaver. 

category imprint: Interpretations within context; Differences between sources

issues: Errors in FE

b. 53-55

composition: Op. 25 No 5, Etude in E minor

No fingering in FC (→GE), FE & EE1

Fingering in EE2 (→EE3)

..

Nothing indicates that the fingering in the L.H. added in EE2 (→EE3) in bars 53 and 55 could have come from Chopin.

category imprint: Differences between sources

issues: EE revisions

b. 57-58

composition: Op. 25 No 5, Etude in E minor

No markings in FC (→GE) & EE

Pedalling in FE

..

The pedalling indications, appearing only in FE, could have been added in the proofreading of this edition.

category imprint: Differences between sources; Corrections & alterations

issues: Authentic corrections of FE

b. 58-60

composition: Op. 25 No 5, Etude in E minor

Single-voice notation in FC (→GE) & EE

Two-voice notation in FE

..

The bottom voice, separated only in FE, was most probably added by Chopin in the proofreading of this edition.

category imprint: Differences between sources; Corrections & alterations

issues: Authentic corrections of FE