gsn_csm_pres_hgt_vector

when i use plot = gsn_csm_pres_hgt_vector(wks,SO2({50000:100000},75:105),U({50000:100000},75:105),V({50000:100000},75:105),res) ,it turns out SO2 isoline only without the windfield!
 
When i change the plot to plot = gsn_csm_pres_hgt_vector(wks,speed({50000:100000},75:105),U({50000:100000},75:105),V({50000:100000},75:105),res) ,it turns out the speed isoline and the windfield!
 
When i change the plot to plot = gsn_csm_pres_hgt_vector(wks,speed({50000:100000},75:105),U({50000:100000},75:105),V({50000:100000},75:105),res) and use the
res@cnFillOn = True
        res@gsnSpreadColors = True
it turns out the speedexpressed by the colors covered the windfield!
 
I want use the plot = gsn_csm_pres_hgt_vector(wks,SO2({50000:100000},75:105),U({50000:100000},75:105),V({50000:100000},75:105),res) and make SO2 expressed by the colors and wind filed,how could i write the commad ,hope for your help!
 

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Received on Fri Sep 7 20:13:20 2012