Interpretation of the pitch of the 2nd and 3rd crotchets in AI poses difficulties – the note heads are slightly bigger than usually, which suggests performed corrections, yet their result is not clear:
-
on the 2nd crotchet of the bar one can see c
2 (more likely) or d2, -
on the 3rd crotchet one can see c2, yet one also cannot exclude b1.
Taking into account the fact that first three crotchets of the text are written at an each time lower pitch and the phrase development in the published version seems to be so natural thanks to repetitions of the four-note motif, one can suppose that the seemingly different notation of AI is simply erroneous, while in the notation of the 3rd crotchet, two clear errors overlapped – lack of 
and inaccurate position of the note head.
As the version of AI we adopt a stylistically acceptable text which imposes itself, while interpreting without detailed analyses and comparisons.
Compare the passage in the sources »
category imprint: Graphic ambiguousness; Differences between sources; Corrections & alterations
issues: Inaccurate note pitch in A
notation: Pitch