1 in 
The version of GE1 must be a mistake – the engraver most probably saw a note where the stem and the ledger line meet in FC, the point of contact of which resulted in a small protrusion (such situations are also to be found in Chopin's autographs, where it can be difficult to settle them, cf., e.g. the Etude in A
Major, Op. 10 No. 10, b. 76).
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category imprint: Differences between sources
issues: Errors in GE, GE revisions
notation: Pitch