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b. 56

composition: Op. 45, Prelude in C♯ minor

..

FE1 and GE are lacking the  lowering dto d1. This patent inaccuracy was corrected in FE2 and EE. Moreover, in FE1 there are no naturals before two last quavers in the L.H.; the remaining sources have a correct text. 

category imprint:

issues: EE revisions , Accidentals in different octaves , Inaccuracies in GE , Inaccuracies in FE , Omission of current key accidentals , FE revisions

b. 57-58

composition: Op. 45, Prelude in C♯ minor

..

Missing from FE1 is the  before the 2nd quaver in bar 57 (c) and in GE – before the last one in bar 58 (c1). FE2 and EE have a correct text.

category imprint: Differences between sources

b. 58

composition: Op. 45, Prelude in C♯ minor

d1-d2 in FE (→EE1)

d1-d2 in GE, EE2 & FEJ

..

The flats lowering d1-d2 to d1-d2 is an error of the engraver of FE1 (→FE2,EE). It is proven by the version of GE and Chopin's hand-written correction in FEJ. The correct text was also introduced into EE2.

category imprint: Differences between sources

issues: Annotations in teaching copies , EE revisions , Errors in FE , Annotations in FEJ

b. 59

composition: Op. 45, Prelude in C♯ minor

..

In FE1 there are no naturals lowering f to and c1 to c1. The signs were added in the remaining editions.

category imprint: Differences between sources

issues: EE revisions , Accidentals in different octaves , Inaccuracies in FE , GE revisions , FE revisions

b. 60

composition: Op. 45, Prelude in C♯ minor

..

In FE1 there are no naturals before the 5th and 7th quavers (both are necessary in the layout adopted in this edition). The signs were added in FE2. The correct text is also in EE and GE (with one natural f). 

category imprint: Differences between sources

issues: EE revisions , Accidentals in different octaves , Inaccuracies in FE , Omission of current key accidentals , FE revisions