Want to plot two separate trend line

Hi,

I am plotting a time series from 1979 to 2008. I want to calculate two
separate trends : one from 1978 to 1995 and other from 1996 to 2008. Is
there any example showing how to draw two separate trend lines like
that.

Thanks,
Soumik

-- 
"Numbing the pain for a while will make it worse when you finally feel 
it.
  ~J.K. Rowling"
*****************************************
Soumik Basu
Graduate Student, Research Assistant
International Arctic Research Center
University of Alaska Fairbanks
Fairbanks,Alaska,USA
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