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b. 1

composition: Op. 28 No. 12, Prelude in G♯ minor

..

The 4th quaver in FE is an erroneous f1, as a result of which the next quaver is also wrong – it is an e1 instead of an e1. A comparison with analog. b. 9, 41 and 49 suggests a mistake; another argument is the presence of a , completely unjustified before f1. The mistake was rectified in EE; a corresponding correction is also in FED.

category imprint: Interpretations within context; Differences between sources

issues: Annotations in teaching copies , EE revisions , Errors in FE , Annotations in FED

b. 1

composition: Op. 28 No. 16, Prelude in B♭ minor

 in A (→FCGE)

 in FE (→EE)

..

The change of time signature in FE probably resulted from the engraver's inattention. In Chopin's pieces, it was common that engravers did not differentiate between  and , see the Prelude No. 14 in E Minor.

category imprint: Differences between sources

issues: Errors in FE , 4/4 or 2/2

b. 1

composition: Op. 28 No. 16, Prelude in B♭ minor

6 accents in A (→FE)

No marks in FC (→GE)

6 vertical accents in EE

..

In this bar Fontana overlooked all performance indications except the slur, i.e. , pedalling markings, accents and the staccato dot in the bass.
The change of font for accents in EE was an arbitrary decision typical of that edition. 

category imprint: Differences between sources

issues: Errors of FC

b. 1

composition: Op. 28 No. 16, Prelude in B♭ minor

Pedalling in A (→FEEE)

No markings in FC (→GE)

..

Fontana overlooked the pedalling markings (as well as almost all performance indications in this bar).

category imprint: Differences between sources

issues: Errors of FC

b. 1

composition: Op. 28 No. 16, Prelude in B♭ minor

Staccato in A (→FE)

No mark in FC (→GE) & EE

..

The missing staccato dot is an oversight of the copyist and the engraver of EE.

category imprint: Differences between sources

issues: Errors in EE , Errors of FC