As I have not specified any more colors to override the default Settings, gnuplot will then use its own default colors for the rest of the graph.
因为我没有指定其他颜色以覆盖默认设置，所以对于图形的其他颜色，gnuplot仍然使用自己的默认颜色。
Use to mark the color with specks of different colors. The range is 0 to 1. The default is 0.
习惯于标记颜色具有不同的斑点的颜色。范围是0到1。缺省的是0。
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