图 4-3. 顺序色标示例。ColorBrewer Blues 色阶是一个从深蓝到浅蓝的单色色阶。Heat 和 Viridis 色阶是多色阶，分别从深红到浅黄，以及从深蓝经由绿色到浅黄。
当我们想显示不同地理区域的数据值如何变化时，用颜色表示数据值特别有用。 ...
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