>>> Mao Jianfeng <jianfeng....@gmail.com> 19/08/2009 08:10:54 >>>
>There is my data and my codes to create a plot. I want to know why
>there are two small circles in the upper right and lower left of the
>plot respectively.
Because your first plot() command put them there.
add type="n" to the first plot command?
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