| http://www.w3.org/ns/prov#value | - In practice, when the aircraft arrives in the vicinity of point A, it is supposed to be at an altitude higher than a predetermined altitude ho which is smaller than R, i.e. above a surface symbolized by a plane Q in FIG. 1 located a distance ho above plane P. The intersection of the half-sphere S and plane Q is the circle T. Additionally, the directional pattern of the aerial of the transponder at
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