upper vertical tail 上垂直尾翼
Figure 1 shows that the increase in variation is almost entirely due to a heavy upper tail to the distribution of the marks.
图1表明，在变化的增加几乎完全是由于沉重的尾巴上的分布情况的痕迹。
Since our main point of interest will be the upper tail of the city size distribution it can be argued that their exclusion does not matter too much for our analysis.
并且由于我们研究的主要兴趣在于城市规模分布的上扬的尾部，所以，那些被剔除的数据对我们的分析没有太大的影响。
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