The primary angles are the basic angle alignment of the wheels relative to each other and to the car body.
2.
The basic angle is a 30-degree Trendelenburg with the hips flexed at 15 degrees; this can be adjusted with leg supports.
3.
The expected accuracies of the final catalogue data have been calculated following in-orbit testing, taking into account the issues of stray light, degradation of the optics, and the basic angle instability.
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