The last C in bar 9 is an exceptionally clear example of the Chopinesque manner of writing notes on ledger lines, which consisted in providing the notehead with an additional vertical line pointing downwards, which could be considered a crotchet stem in some situations – see the Mazurka in B
minor, Op. 24 No. 4, bar 23. E in bar 12 is also provided with such a line, shorter yet still distinct.
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category imprint: Graphic ambiguousness; Source & stylistic information
issues: Uncertain notes on ledger lines
notation: Rhythm