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b. 10

composition: Op. 28 No. 2, Prelude in A minor

..

The correction visible in As allows us to decipher the initial rhythm of the 2nd and 3rd R.H. notes – they were two semiquavers.

category imprint: Corrections & alterations; Source & stylistic information

b. 10-11

composition: Op. 28 No. 4, Prelude in E minor

Version in As

Rhythm in A (→FE→EE) & CGS

Rhythm in FC (→GE)

Rhythm in FED, possible interpretation
..

The version of As, replaced then by the final edition of those motifs, resulted from corrections itself. Their traces in the form of crossings-out are almost invisible on the available photograph; however, a comparison with similarly looking corrections in b. 18-19 suggests that in both places Chopin began with similar ideas and then changed them in a similar manner.
The change of the long grace note to a short one was an arbitrary decision of Fontana, certainly contrary to the intention of Chopin, which is particularly confirmed by the Chopinesque entry in FED, difficult to interpret as a whole, but in terms of rhythm almost certainly tantamount to the addition in b. 19, which is perfectly clear.

category imprint: Graphic ambiguousness; Differences between sources; Corrections & alterations; Source & stylistic information

issues: Main-line changes , Fontana's revisions

b. 10-12

composition: Op. 28 No. 4, Prelude in E minor

2 slurs in As

2 slurs in A (→FC)

2 slurs in GE

Slur in FE
..

The longer slur of As is probably the initial version, concerning the crossed-out version of the melodic line in b. 10-11. It is indicated by a second slur between b. 11-12, which begins only just over the a1 crotchet, added (or left) as valid after corrections.
It most probably means that the second slur was also added only after those corrections, probably with intent to replace the first, longer slur with it.
The missing slur in b. 11-12 in FE (→EE) is a mistake of the engraver; in turn, leaving the grace note in b. 11 out of the slur in GE and adding a little slur combining that grace note with the crotchet in EE are editorial revisions.

category imprint: Differences between sources; Corrections & alterations; Source & stylistic information

issues: EE revisions , Errors in FE , GE revisions

b. 10

composition: Op. 28 No. 8, Prelude in F♯ minor

..

GE and EE added a  before b2. However, the Chopinesque  before b1 is a cautionary accidental; in this context, repeating it next to the 2nd demisemiquaver (placed an octave higher) of this group does not seem necessary.

category imprint: Differences between sources; Source & stylistic information

issues: EE revisions , GE revisions , Cautionary accidentals

b. 10

composition: Op. 28 No. 8, Prelude in F♯ minor

No slur in A

Slur in FC (→GE) & FE (→EE)
..

The missing slur over the 1st L.H. figure must be Chopin's mistake. The slur was added in both sources based on A, perhaps not even having noticed its absence.

category imprint: Differences between sources

issues: Errors of A , FE revisions , Fontana's revisions