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Source:
p. 6, b. 108-138
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The corrections visible in FC in this and the previous bar – shift of 
from bar 137 to bar 138 and addition of con forza – prove a possible addition of indications in all three Stichvorlage manuscripts by Chopin. 
in EE can be authentic, although a possibility of a kind of mistake cannot be entirely excluded.
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category imprint: Differences between sources; Corrections & alterations
issues: Authentic corrections of FC
notation: Verbal indications
Missing markers on sources:
FC, FE1, FE2, FED, FEJ, FES, GE1, GE1a, GE2, GE3, EE1, EE2, EE3, GE1b