GC
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The 
lowering e1 to e flat 1 is missing from both bars in GC and FE1. This obvious inaccuracy was corrected in GE and FE2. The flat occurring in EE in bar 15 may also be part of the reviser's corrections (bar 14 in EE has no relevant note).
Compare the passage in the sources »
category imprint: Source & stylistic information
issues: Accidentals in different octaves, GE revisions, FE revisions
notation: Pitch