overlap population

机械英汉词典（O-3）-机械资讯-马棚网 ... overlap peaks 重叠峰 overlap population 重叠分布 overlap radar 重叠雷达 ...

...opulation) ; 原子 k 和 l 间的"重叠布居数" (overlap population) . 3 个"子集居"可形象地比喻为两个城市和它们的 一个共用郊区...

我在文献中看到有交叠聚居数（overlap population），请问是怎么算的？表征了什么？