At the beginning of bars 17, 19, 23 and 25 A includes 
indications, while in bar 21 – 
. In the editions all marks were omitted and instead of there is . Due to the fact that all other dynamic indications in these bars were more or less accurately reproduced, it seems highly unlikely that the changes had not been accepted and partially introduced by Chopin. Therefore, in the main text we leave the version of FE (→GE,EE) without any additions. The version of A may be considered as an alternative one.
In bar 21 the erasure visible in A allows to conclude that originally Chopin most probably wrote there 
.
Compare the passage in the sources»
category imprint: Differences between sources; Corrections & alterations
issues: Inaccuracies in FE, Corrections in A, Authentic corrections of FE
notation: Verbal indications