FES
compare
Although the notation of the source is clear, there are as many as five signs in FES that show in a detailed manner the rhythmic relations of both hands. Those signs are probably meant to facilitate the a vista playing through showing the synchronization of the L.H. and the R.H. part. Cf. bar 35-36.
Compare the passage in the sources »
category imprint: Differences between sources
issues: Synchronization markings, Annotations in FES
notation: Rhythm