Assertion: duck's range | /r/HasProperty | a perfectly level target area
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text: It is also worth noting that the graphs of lethal ranges of weapon effects as a function of yield, that are commonly encountered, are the unobstructed "open air", or "free air" ranges that assume amongst other things, a perfectly level target area, no passive shielding such as attenuating effects from urban terrain masking, e.g. skyscraper shadowing, and so on.