The code below produces the correct plot in a window and in a png file. However, in pdf-output when viewed with Acrobat 9 Pro under Windows 7, there are strange residual borders; these do not turn up with Sumatra viewer. The code below produces the correct plot in a w
阅读背景：
仅在ggplot pdf中有不需要的剩余边框
来源：互联网
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