How to make ref vector smaller in size

Hi,

I am trying to make a vector plot. I am attaching the plot. Can anyone
suggest me how do I make the ref vector smaller in size keeping the
arrows in the plot exactly the same size as they are now.
Also is it possible to plot only vectors above a certain magnitude so
that I can filter out the small vector arrows. Here is my vector
resources:

   vres = True
   vres@vcRefMagnitudeF = 1e+06 ; make vectors
larger
   vres@vcRefLengthF = 0.5 ; ref vector
length
   vres@vcGlyphStyle = "LineArrow" ; turn on
curly vectors
   vres@vcMinDistanceF = 0.01 ; thin the
vectors
   vres@vcRefAnnoOrthogonalPosF = -0.13 ; Move ref
anno into plot

   vres@mpCenterLonF = 180

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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