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b. 16

composition: Op. 10 No 4, Etude in C♯ minor

..

We add a cautionary  before B. The sign was added already in GE1a (→GE2GE3GE4GE5) and EE4.

category imprint: Differences between sources

issues: EE revisions , GE revisions

b. 17

composition: Op. 10 No 4, Etude in C♯ minor

..

FE (→EE) has a  only before the upper note of the third in the middle of the bar. The sign before c1 is completely unnecessary here, however, the undoubtedly necessary  raising to a is missing. AI has the correct text, the mistake was also corrected in GE. 

category imprint: Differences between sources

issues: Errors in FE , GE revisions

b. 19

composition: Op. 10 No 4, Etude in C♯ minor

F in AI

E in FE (→GE,EE)

..

E in FE (→GE,EE) is probably erroneous – cf. similar figurations in bars 13-14 and 63-66 – hence in the main text we give F written in AI. The error probably consisted in putting a single sharp instead of the double one before the intended E note. See bar 15

category imprint: Interpretations within context; Differences between sources

issues: Errors in FE

b. 19-20

composition: Op. 10 No 4, Etude in C♯ minor

in AI

in FE (→GE,EE)

..

In the version prepared for print, Chopin preferred the more consistent texture and articulation. Cf. the Etude in A minor, No. 2, bars 3-4 and 16.

category imprint: Differences between sources; Corrections & alterations

b. 23

composition: Op. 10 No 4, Etude in C♯ minor

a1 in AI, FE (→GE) & EE3 (→EE4)

..

The  raising a1 to awas omitted in EE2. This patent error was corrected in EE3 (→EE4).

category imprint: Differences between sources

issues: Errors in EE