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. 136-139

composition: Op. 30 No. 4, Mazurka in C# minor

slentando in FC (→GE)

smorz. - - in FE (→EE)

..

Chopin entered slentando into FC (→GE). Similarly, Chopin added the smorz. - - indication present in FE (→EE) probably only just while proofreading this edition.
Therefore, both indications, of a similar meaning, can be regarded as equal variants.

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

issues: Authentic corrections of FE , Authentic corrections of FC

b. 137

composition: Op. 24 No. 4, Mazurka in B♭ minor

A short accent in A (→GEFEEE)

Our proposition

..

The accent that can be seen in A (→GEFEEE) must be considered a short one. However, if we compare that bar with bars 121, 127 and 133, in which A clearly has long accents, we begin to suspect that the accent mark may have been written by Chopin in a hasty and inaccurate manner. 

category imprint: Interpretations within context

issues: Long accents

b. 137

composition: Op. 24 No. 4, Mazurka in B♭ minor

..

We add a cautionary  before g flat.

category imprint: Editorial revisions

b. 137

composition: Op. 38, Ballade in F major

..

We add the cautionary naturals next to F-f. A similar addition was performed also in GE2 (→GE3).

category imprint: Differences between sources; Editorial revisions

issues: GE revisions

b. 137

composition: Op. 26 No 2, Polonaise in E♭ minor

Pedalling in A (→FEGE)

No markings in EE

..

EE overlooked the pedalling indications in bar 137.

category imprint: Differences between sources

issues: Errors in EE