Dear R-helpers,
   
  I have been using \n in my plot titles to split long titles into two lines.  I recently tried combining \n and plotmath which still gives me two lines for the title but also a weird blank spacing.  A simple example is as follows:

plot(1:10, main=expression(paste("Exposure\nTemp (", degree*F, ")")))

Is there something I'm missing to close the spacing.  I have searched the R-help archives to no avail.  I am using R-2.3.0 with Windows XP.

Thank you in advance for any help.
  
D. Arenas 

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