Hi @alphatierchen, thanks for getting in touch.. the head movements are indeed compensated in such a way that the eye gaze reported will remain consistent (Assuming you focus on the same point) regardless of how you move your head.
If you wish to look at exact metrics, it would be beneficial to check out our XR SDK which can provide streaming data on both the gaze data and head tracking metrics which you can read about @ https://vr.tobii.com/sdk/
If you have a more specific query, please don’t hesitate to get in touch again, best wishes.