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b. 40

composition: Op. 10 No 11, Etude in E♭ major

a in A (→FEGE) & EE4

in EE3

..

Lack of the  in EE3 before the lowest note of the last chord is certainly an error, corrected in EE4.

category imprint: Differences between sources

issues: EE revisions , Errors in EE

b. 41

composition: Op. 10 No 11, Etude in E♭ major

..

In the last proofreading of FE (→EE) a cautionary  before was added before the 4th chord (the accidental is absent both in A and GE). We add naturals before d1 and d2 in the 2nd chord instead. 

category imprint: Differences between sources; Editorial revisions

issues: Cautionary accidentals , Authentic corrections of FE

b. 42

composition: Op. 10 No 11, Etude in E♭ major

f in A, GE & EE

g in FE

..

as the lowest note of the 3rd chord is almost certainly an error of the engraver of FE.

category imprint: Differences between sources

issues: EE revisions , Errors in FE , GE revisions

b. 43

composition: Op. 10 No 11, Etude in E♭ major

e1 in chord in A

No e1 in FE (→GE,EE)

..

The lack of e1 in the 2nd L.H. chord is most probably due to difficulties in reading A. In Chopin's autographs, internal chord notes placed on ledger lines are often barely visible. This leads to their presence (or lack of) being hard or even impossible to ascertain. Cf. e.g. Etudes in G Op. 10 No 5, bar 15 or in A Op. 10 No 10, bars 76-77.

category imprint: Differences between sources

issues: Inaccuracies in FE , Uncertain notes on ledger lines

b. 44

composition: Op. 10 No 11, Etude in E♭ major

e in A, GE & EE

in FE

..

as the lowest note of the chord on the 2nd quaver in the bar is most probably the engraver's error. The note was changed to e both in GE and EE.

category imprint: Differences between sources

issues: EE revisions , Errors in FE , Terzverschreibung error , GE revisions