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b. 10

composition: Op. 28 No. 8, Prelude in F♯ minor

..

In the 1st group of demisemiquavers in this bar, one can see in A a crossed-out accidental – most probably a  – before the 3rd demisemiquaver. Formally, the accidental is not necessary here; it is absent both in FC and FE (→EE1). However, the presence of the f pedal note as well as f2 at the end of the previous bar justify its addition in the form of a cautionary accidental, which was performed in GE and EE2.
See also the next note.

category imprint: Differences between sources; Editorial revisions; Corrections & alterations

issues: EE revisions , GE revisions , Cautionary accidentals , Deletions in A

b. 11

composition: Op. 28 No. 8, Prelude in F♯ minor

..

In the main text we add a reminder  before g2 at the end of the bar. The accidental was already added in GE and EE

category imprint: Differences between sources; Editorial revisions

issues: EE revisions , GE revisions

b. 12

composition: Op. 28 No. 8, Prelude in F♯ minor

in A (→FEEE)

No sign in FC (→GE)

..

The lack of the  hairpin in FC (→GE) is Fontana's error.

category imprint: Differences between sources

issues: Errors of FC

b. 12

composition: Op. 28 No. 8, Prelude in F♯ minor

..

In A (→FC,FE) there is no  lowering e to e in the last L.H. figure. The patent inaccuracy was corrected in GE and EE.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Accidentals in different octaves , GE revisions , Omission of current key accidentals , Inaccuracies in A , Errors repeated in FE

b. 12

composition: Op. 28 No. 8, Prelude in F♯ minor

a in A (→FE,FCGE)

b in EE

..

Nothing indicates the authenticity of the EE version – it is arguably the engraver's mistake.

category imprint: Differences between sources

issues: Errors in EE