Assertion: radar's beam | /r/HasProperty | filled with rain
Facets:
Source sentences:
text: The radar beam broadens with distance, thus decreasing the proportion of the beam which is filled with rain, which reduces the echo intensity; b) The radar beam becomes further from the ground with distance (partly because of the Earth's curvature, and partly because the beam is angled upwards by a fraction of a degree), thereby missing the lower parts of the rain.