Select: 
Category
All
Graphic ambiguousness
Interpretations within context
Differences between sources
Editorial revisions
Corrections & alterations
Source & stylistic information
Notation
All
Pitch
Rhythm
Slurs
Articulation, Accents, Hairpins
Verbal indications
Pedalling
Fingering
Ornaments
Shorthand & other
Importance
All
Important
Main


b. 17

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

No markings in As & CGS

  in A (→FCGE, →FEEE)

..

As has no performance markings, including the pedalling. The absence of markings in CGS might result from careless writing or lack of space.
See also the note in the next bar.

category imprint: Differences between sources

b. 18-19

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

Version in As

Rhythm in A (→FEEE)

Rhythm in FC (→GE)

Rhythm in FED

..

In an earlier version of As, two versions of the ending of these bars – one- and two-note – were presented in reverse order. The crossings-out visible in As suggest that Chopin initially wrote there more complex figures, comprising three or even four notes. The rhythmic variants at the end of b. 19 – see the note on b. 11 and 19.

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

issues: Main-line changes

b. 18

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

Slur in first half of bar 18 in As

Slur over entire phrase in remaining sources

..

Instead of a slur over the entire phrase in b. 13-19, As includes only a half-bar slur in b. 18. The appearance of a slur in this exact place can be related to the draft, incomplete nature of the manuscript; however, it is likely that Chopin's first impulse was to write down this group of quavers as a quintuplet, yet he changed the concept still before writing a digit '5' under the slur (irregular groups were generally marked by Chopin with a slur and a digit).

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

b. 18

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

..

We add a cautionary  to d2 in the main text. The accidental was added only in GE2 (→GE3).

category imprint: Differences between sources; Editorial revisions

issues: GE revisions

b. 18

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

No markings in As & CGS

 under 3rd quaver in A (→FCGE) & FE2 (→EE)

 under 1st quaver in FE1

..

The absence of pedal markings in As and CGS – see the note in bar 17. The earlier placement of the  sign in FE1 is certainly due to an inapt interpretation of A wherein the letter 'p' actually starts already under the first quaver. The inaccuracy was corrected in FE2.

category imprint: Differences between sources

issues: Inaccuracies in FE , FE revisions