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b. 6
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composition: Op. 28 No. 24, Prelude in D minor
..
At the end of the bar, one can see a crossed-out category imprint: Corrections & alterations; Source & stylistic information issues: Corrections in A , Deletions in A |
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b. 6-9
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composition: Op. 28 No. 23, Prelude in F major
..
The slurring of FC (→GE) proves the copyist's distraction, perhaps due to haste. The change between b. 6 and 7 could be explained by an inaccurate interpretation of the ending of the slur added in A (Chopin must have meant leading the slur to the last semiquaver in the bar and not combining it with the next one). The broken slur between b. 7 and 8 probably is an inaccurate interpretation of A (the fragment of the slur at the beginning of b. 8 is poorly visible in A) or a mistake (b. 8 ends the line in FC, just as b. 7, which begins similarly, ends the line in A). The slur at the end of b. 8, which ends the line, implying that it should be continued may have simply been carelessly written down. category imprint: Differences between sources issues: Errors of FC |
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b. 6
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composition: Op. 28 No. 23, Prelude in F major
..
Nothing indicates that the fingering in EE could have come from Chopin. category imprint: Differences between sources issues: EE revisions |
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b. 6
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composition: Op. 28 No. 21, Prelude in B♭ major
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In FE the category imprint: Differences between sources issues: EE revisions , Errors in FE , Fontana's revisions |
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b. 6
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composition: Op. 28 No. 21, Prelude in B♭ major
..
The sources do not contain an accidental before the top note of the third on the 4th quaver in the bar, as a result of which it should be interpreted as e-g category imprint: Interpretations within context; Editorial revisions issues: Omissions to cancel alteration , Errors of A , Errors repeated in GE , Errors repeated in FE , Errors repeated in EE |
marking in 
before the 2nd quaver is misplaced: it should be before the bottom note (g
), not the top one (e
to be obvious in this place.