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b. 3
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composition: Op. 28 No. 16, Prelude in B♭ minor
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In A the category imprint: Source & stylistic information issues: Accidental below/above the note |
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b. 3-4
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composition: Op. 28 No. 16, Prelude in B♭ minor
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In A one can see that three accidentals were crossed out; it seems that Chopin wrote them "just in case." Afterwards, it turned out that they were superfluous – the category imprint: Source & stylistic information issues: Cautionary accidentals , Deletions in A |
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b. 3-15
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composition: Op. 28 No. 10, Prelude in C♯ minor
category imprint: Graphic ambiguousness; Differences between sources issues: Long accents |
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b. 3
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composition: Op. 28 No. 18, Prelude in F minor
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We add cautionary flats before the penultimate semiquaver d A flat is also visible there (in the R.H.) in FC. It is a later annotation, absent from GE. category imprint: Interpretations within context; Differences between sources; Editorial revisions issues: EE revisions , Errors in EE |
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b. 3
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composition: Op. 2, Variations, complete
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In the main text we add cautionary flats to b category imprint: Differences between sources; Editorial revisions issues: GE revisions , Cautionary accidentals |
and the 
before the 9th and the 11th semiquavers in the bar are placed clearly lower than the notes they concern – more or less at the level of the 2nd ledger line. There is a similar situation in b. 19, although less distinct. Such a notation is often to be found in Chopinesque autographs, cf., e.g. the Etude in F Major, Op. 10 No. 8, 
3 and g
