It is unclear whether the 
mark is to be understood as a diminuendo hairpin or as a long accent. Placing the mark over the R.H. part, which limits its impact to this part or to the melodic voice, suggests the latter. The considerable size of the mark in FE could be a side effect of the non-densely packed text in this edition – the mark in [A], in spite of a similar position between a crotchet and a quaver, could have been much shorter, as evidenced by GE. A hairpin would be supported by the presence of 
in the 2nd half of the bar – after the octave sequence in the previous bar, played 
, a diminuendo would provide a natural path to this . In this case, the sense of the mark would be clearer if it were placed between the staves. Therefore, a third alternative interpretation would be a between the staves.
Compare the passage in the sources»
category imprint: Graphic ambiguousness; Differences between sources
issues: Long accents, Inaccuracies in GE, Scope of dynamic hairpins
notation: Articulation, Accents, Hairpins