I also see this. It seems that the 100th point plotted is not connected to the 
101st, regardless of the actual data values. A more visually dramatic example is

   x<-seq(0,8*pi,length=102)
   plot(x,cos(x),type="l")

which makes it clear that the problem isn't just something like antialiasing. 
The gap doesn't appear in pdf().

     -thomas

Thomas Lumley                   Assoc. Professor, Biostatistics
[EMAIL PROTECTED]       University of Washington, Seattle

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