CLI
Main text
CLI - Copy by Linowski
Ap - Presentation autograph
FE - French edition
FEcor - Chopin's FE proof
FE1 - First French edition
FE2 - Corrected impression of FE1
FED - Dubois copy
FEJ - Jędrzejewicz copy
FES - Stirling copy
GE - German edition
GE1 - First German edition
GE1a - Corrected impression of GE1
GE2 - Second German edition
GE3 - Third German edition
GE4 - Fourth German edition
GE5 - Fifth German edition
EE - English edition
EE2 - Second impression of [EE1]
EE3 - Corrected impression of EE2
EE4 - Revised impression of EE3
compare
  b. 19-20

In the majority of the sources, including all authentic sources, some necessary accidentals in the part of the R.H. are missing. The inaccuracies do not pose problems in establishing the correct text. Below the list of omissions in particular sources:

  bar 19 bar 20
   b1  d2  c2  f2  d2  b1  d2  a2  b1
CLI
Ap + + + + + +
FEcor + + + + +
FE,EE2 + + + + + +
GE1 + + + + + + + +
EE3 + + + + + + + +
GE2-5,EE4 + + + + + + + + +

 bmarks the sign before the 2nd chord in the bar in both bars.
Moreover, in all sources except for Ap the unnecessary  before f2, the 14th semiquaver in bar 20, is repeated. 

Compare the passage in the sources »

category imprint: Interpretations within context; Differences between sources

issues: EE revisions, Errors in FE, Accidentals in different octaves, Omissions to cancel alteration, GE revisions, Errors of A, Authentic corrections of FE, Errors of CLI

notation: Pitch

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Original in: Muzeum Fryderyka Chopina, Warszawa