Non-existent. Google translate for the lab commentary.How’s your Polish?
Red line: On-axis (tweeter height)
Black line: on-axis with grille (excellent grille, does not produce any anomalies whatsoever
Brown line: 15o off-axis horizontal (can hardly tell it apart from on-axis, so good horizontal directivity)
Yellow line: 30o off-axis horizontal (follows the on-axis and 15o lines well, so more good horizontal directivity)
Green / Blue lines: 7o off-axis down / up vertically (good vertical directivity as well)
So it seems they are not fussy with placement, you do not have to point them exactly at you, or sit exactly at tweeter level.
Other than the dip in the 2-4 kHz region (quite common in many speakers), they seem to operate within +2dB from 200 Hz to about 12kHz.
Of course spinorama data will provide more detail, including reflections and estimated in room response, but all in all it looks good.
Congrats on your end game! Hope to reach that point in the near future.