Observed clusters should be modelled by considering the distribution function (DF) to be a random variable that quantifies the degree of excitation of the system’s normal modes. A system of canonical coordinates for the space of DFs are identified so DFs can be weighted in a consistent way.

中文翻译：

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概率分布函数

应通过将分布函数 (DF) 视为量化系统正常模式的激励程度的随机变量来对观察到的集群进行建模。确定了 DF 空间的规范坐标系统，因此可以以一致的方式对 DF 进行加权。