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b. 13

composition: Op. 28 No. 18, Prelude in F minor

..

In the main text we add cautionary flats before e and e1.

category imprint: Editorial revisions

b. 13

composition: Op. 28 No. 18, Prelude in F minor

..

EE erroneously has e as the 2nd L.H. semiquaver.

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , Errors in EE , Terzverschreibung error

b. 15

composition: Op. 28 No. 18, Prelude in F minor

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In A there is no  before the top note of the L.H. chord on the 4th beat of the bar. The patent inaccuracy was already corrected in FC (→GE) and FE (→EE).

category imprint: Interpretations within context; Differences between sources

issues: Accidentals in different octaves , FE revisions , Fontana's revisions , Inaccuracies in A

b. 16-17

composition: Op. 28 No. 18, Prelude in F minor

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In A entire b. 16 and the 1st R.H. quaver in b. 17 were first written in an earlier version: . Chopin then crossed them out entirely and entered the final text, although not without hesitation (mistakes?) – in the later version the 6th R.H. quaver was initially written down in the original version (d2-d3), while at the beginning of b. 17 there was most probably an f1-a1-d2-fchord.
See also the note in b. 17.

category imprint: Corrections & alterations; Source & stylistic information

issues: Corrections in A , Deletions in A , Main-line changes

b. 17

composition: Op. 28 No. 18, Prelude in F minor

Without e1 in arpeggio in GE1

e1 in A (→FC,FEEE) & GE2 (→GE3)

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The missing e1 in GE1 must be an oversight of the engraver. The mistake was corrected in GE2 (→GE3).

category imprint: Differences between sources

issues: Errors in GE , GE revisions