[R] Highlight Points in a Plot

SamT sam.tischfield at gmail.com
Mon May 3 21:16:24 CEST 2010

For simplicity we'll assume my code looks as follows


which produces a diagonal line.  

Ideally, I'd like to highlight or label in a different color certain X
values (say 50,55,60,65)

Is there a function which will allow me to do this? 
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