½A
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While writing 
, Chopin probably used a former convention, according to which a sign was put near to the middle of the range of its validity (in this case bars 253-254). This kind of notation is probably to be found in, e.g. the Etude in C major, op. 10 no. 1, bar 45.
Compare the passage in the sources »
category imprint: Interpretations within context; Editorial revisions
issues: Centrally placed marks
notation: Verbal indications