Issues : Errors in FE

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. 17-18

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

No sign in As, FE (→EE1) & CGS

in A

in FC

 in GE, contextual interpretation

in EE2

..

The high position of the L.H. chords and the resulting lack of space between the staves contributed to inaccuracies and mistakes in the reproduction of the  hairpin – it was moved in FC (→GE, inaccurately) and overlooked in FE (→EE1). The mark in EE2 was added on the basis of GE1, overlooking its ending at the beginning of b. 18. In GE, there is a complete  mark at the end of the line (in b. 17), in spite of the fact that b. 18 contains its ending in the form of a new  mark – in times of Chopin, the contemporary, more accurate notation of such divided hairpins was not generally used yet. The absence of the mark in CGS is one of the arguments supporting the fact that the copy was prepared on the basis of FE.

category imprint: Interpretations within context; Differences between sources

issues: Errors in FE , Scope of dynamic hairpins , Inaccuracies in FC , Hairpins denoting continuation

b. 22-23

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

Dashes up to bar 23 in A

Dashes in bar 22 in FC

No dashes in FE (→EE), GE & CGS

..

The missing dashes marking the range of smorzando is an inaccuracy of FE (→EE) and GE, quite frequent in Chopinesque first editions.

category imprint: Differences between sources

issues: Errors in FE , Errors in GE , Inaccuracies in FC