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Source:
p. 12, b. 485-528
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b. 506-508
The version with g3 (in b. 506) and g2 (in b. 508) would be possible but for a broader harmonic context, and especially the E minor key in force here since b. 495. Therefore, there is no doubt that Chopin omitted naturals and the version of GE is correct.
Compare the passage in the sources»
category imprint: Differences between sources
issues: Errors in FE, Errors in EE, GE revisions, Omission of current key accidentals, Errors of GC
notation: Pitch