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Verbal indications

b. 1

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

..

In A we can see the initial tempo indication having been deleted – Presto con fuoco.

category imprint: Corrections & alterations; Source & stylistic information

issues: Corrections in A , Deletions in A , Changes of tempo markings

b. 9

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

in A (→FEEE)

No marking in FC (→GE)

..

Fontana overlooked  in FC (→GE).

category imprint: Differences between sources

issues: Errors of FC

b. 13-14

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

New cresc. from bar 13 in A, literal reading

cresc. continued in bar 14 in FC (→GE)

cresc. continued in bar 13 in FE (→EE)

..

In the main text we reproduce the notation of A literally, in which cresc. in b. 13 somehow initiates a second wave of growth of dynamics. However, it is likely that Chopin meant it to continue the cresc. that began in b. 9, while its repetition in b. 13 was supposed to remind us what the dashes concern (b. 13 opens a new page in A). Therefore, the version of FE (→EE), in which this is how it was interpreted, may be considered an equal variant. 

category imprint: Graphic ambiguousness; Differences between sources

issues: Inaccuracies in FC , Inaccuracies in A

b. 17

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

in A (→FEEE)

No indication in FC (→GE)

..

The missing  mark must be Fontana's mistake.

The crossing-out visible in A proves that Chopin initially entered that mark before the f3-f4 octave.

category imprint: Differences between sources; Corrections & alterations; Source & stylistic information

issues: Corrections in A , Deletions in A , Errors of FC