How to plot wind exceeding 95% in bold arrows...?

I made the composite of wind vectors (for u and v components)..Also I have
done the significance test by using ttest.(s1=31 and s2=1891) separately for
u and v.Now I want to plot the composite in which the wind exceeding 95% are
to be represent in bold arrows and winds which is not significant are to be
represent in thin arrows..How I can do this in ncl ?

sX=31
sY=1891

alpha_u = 100.*(1. - ttest(aveX_u, varX_u, sX,aveY_u,varY_u,sY,True,False))
alpha_v = 100.*(1. - ttest(aveX_v, varX_v, sX,aveY_v,varY_v,sY,True,False))

Any help would be appreciated...
Thanks in advance..

-- 
**********************************
Sabeerali
Climate and Global Modeling Division
Indian Institute of Tropical Meteorology
Pashan, Pune, 411 008
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Received on Wed Apr 21 05:49:30 2010