axis values are -6,-4,-2, 0, 2,4, 6 with some y values in a density plot. Is it possible to Add dotted vertical lines on certain x-axis values (Forex: -3 and +3 )using ggplot ?axis values are -6,-4,-2, 0, 2,4, 6 with some y
阅读背景：
使用ggplot在特定的x轴值上添加一条虚线
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