In Atut, a 
is written only next to the minim in the top voice. This patent inaccuracy was corrected already in FE (→GE,EE). The cautionary 
before c
2 in this chord, present in all sources, is also noteworthy; it is unjustified in this context (omitted in the main text).
Compare the passage in the sources »
category imprint: Interpretations within context; Differences between sources; Editorial revisions
issues: Accidentals in different octaves, Cautionary accidentals, FE revisions, Inaccuracies in A
notation: Pitch