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b. 19

composition: Op. 28 No. 17, Prelude in A♭ major

g-d1-e1 in FCI & A (→FEEE)

g-e1 in FC (→GE)

..

The version of FC (→GE) resulted from the copyist having overlooked d1 in the last chord in the bar.

category imprint: Differences between sources

issues: Errors of FC

b. 19

composition: Op. 28 No. 17, Prelude in A♭ major

..

The  before the top note of the last R.H. quaver appears only in FCI. This produces no error in A and the sources retaining the original arrange­ment of chords – FC and GE – for an appropriate  appears on the upper staff before the 2nd L.H. quaver. However, in FE (→EE) which printed the entire L.H. part on the lower staff (as in our transcriptions), the accidental should have been added, but was not.

category imprint: Interpretations within context; Differences between sources

issues: Errors in FE , Errors repeated in EE

b. 19

composition: Op. 28 No. 17, Prelude in A♭ major

..

In A (→FC,FE) as well as in FCI there is no  raising e to e. The obvious Chopin's inaccuracy was corrected in GE and EE.
FC also lacks  in front of the first L.H. quaver, E. Fontana's error was corrected in GE.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Accidentals in different octaves , GE revisions , Errors of FC , Inaccuracies in A , Errors repeated in FE

b. 20

composition: Op. 28 No. 17, Prelude in A♭ major

e-e1 in A (→FE,FCGE) & EE2

e-e1 in EE1

..

The missing sharps before the 3rd L.H. quaver must be an inadvertence of the engraver of EE1, corrected in EE2.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Errors in EE

b. 20

composition: Op. 28 No. 17, Prelude in A♭ major

..

In A one can see that Chopin initially wrote here a longer, whole-bar pedal.

category imprint: Corrections & alterations; Source & stylistic information

issues: Corrections in A , Deletions in A