The discovery of the rain was also conducted by measuring the speed radar feedback Z at determined (called H often retrieved by 1 km and 3 km) above the ground and below the melting level in the range of radar detection at the same time precipitation region identification by the threshold (the target) of Z for rain (region would have exceeded this target is the Z region with rain). For example, when the existence of photos radio feedback (PHVT) mixed floor-area of, signs to distinguish the region with rainbeams are:
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