In FE, one can see traces of removal of the third 
. Chopin most probably reduced the dynamics from 
to 
. Shift of to the beginning of the bar, giving the same image, seems to be much less likely, since the difference in position of the mark before and after proofreading would have been too insignificant to be worth attention.
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category imprint: Corrections & alterations; Source & stylistic information
issues: Authentic corrections of FE
notation: Verbal indications