R folks,

  I am trying to create a mhtplot plot that will alter the point size via the 
plot point value.    The size of the point should change via a set criteria 
such as:

if  point value <10^-6 size 3x
else if 10^-3> point value >10^-6 size 2x
else point value >10^-3 size is x

I consider myself an R newbie, and I am assuming that I could do this via some 
sort of function to change the parameter cex value of the plot, but I do not 
even know where to begin.  I have searched for something similar to this, but 
have not had any luck.  Is it possible to write a function that will alter the 
cex value via the plot value.  Any suggestions?

Thanks in advance,
Doug

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