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b. 4-5

composition: Op. 28 No. 21, Prelude in B♭ major

..

In the main text we include the fingering entered most probably by Chopin into FES. In addition to digits, there is also a mark implying that the e1 note should be performed by the R.H., which the notation of FE completely ignores, since the note was moved to the bottom stave. An analogous hint, in the form of an additional quaver flag pointing upwards, is also in FEJ. In the main text, in which we keep the original division of the text between the staves, we do not include those annotations, since they are superfluous.
See the previous note. 

category imprint: Differences between sources

issues: Annotations in teaching copies , Annotations in FES

b. 4

composition: Op. 28 No. 21, Prelude in B♭ major

Fingering digit written into FEJ

No teaching fingering

category imprint: Differences between sources

issues: Annotations in teaching copies , Annotations in FEJ

b. 5

composition: Op. 28 No. 21, Prelude in B♭ major

..

In the main text we add a cautionary  before g. The accidental was also added in EE.

category imprint: Differences between sources; Editorial revisions

issues: EE revisions

b. 5-6

composition: Op. 28 No. 21, Prelude in B♭ major

No fingering in A (→FE,FCGE)

Fingering in EE

category imprint: Differences between sources

issues: EE revisions

b. 6

composition: Op. 28 No. 21, Prelude in B♭ major

..

In FE the  before the 2nd quaver is misplaced: it should be before the bottom note (g), not the top one (e1). The mistake possibly stemmed from the graphical similarity between b. 5 and 6. The correct accidental was added in FES, while FC (→GE) and EE not only added the right flat, but also removed the wrong one.

category imprint: Differences between sources

issues: EE revisions , Errors in FE , Fontana's revisions