本文探讨了数据度量的概念，即在图表中用于定位或绘制数据的实际图形元素，如条形图中的条形、散点图中的点等。文章还讨论了如何通过使用数据本身来构建这些度量，从而增加图形的量化细节和维度。
1. data measure: the graphical element that actually locates or plots the data is the data measures.
like, the bars of a bar plot; the dots of a scatterplot; the dots and the dashes of a dot-dash-plot and so on.
the ink of the data measure can itself carry data. Building data measures out of the data increases the quantitative detail and
dimensionality of a graphic. ( link to a third, fourth variable)
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