FE
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Both slurring variants are almost certainly authentic and musically justified. The EE and GC (→GE) version seems more informative - it suggests both overall continuity and uniformity of the phrase of bars 542-567 as well as marks the beginning of of the last decisive phrase of crescendo. Therefore, we present it in the main text, even though thef FE version may be the later one.
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category imprint: Differences between sources
notation: Slurs