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. 25-26

composition: Op. 28 No. 6, Prelude in B minor

Slur in A (→FEEE) & CGS

No slur in FC (→GE)

..

The missing slur is one of a few oversights of Fontana in this Prelude – cf. b. 8 and 22.

category imprint: Differences between sources

issues: Errors of FC