[R] Why are there small circles in my plot

[S Ellison]

>>> Mao Jianfeng <jianfeng.mao at 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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