help: how to remove the labels on the left axis when using function "gsn_csm_pres_hgt_vector"?

Hi,
    I can not remove the labels on the left axis,that is "Level", using function "gsn_csm_pres_hgt_vector". I tried setting
         "res_at_tiYAxisOn = False ",
but, it did not work.
    Howerver , "res_at_tiYAxisOn = False " can remove the "Level" in fuction gsn_csm_pres_hgt.
    Can anyone help me about this?
    I attached the test data and my scripts behind.
;----------
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/shea_util.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
begin

    fi = addfile("test.nc","r")
    uz = fi->uz(:,:,0)
    vz = fi->vz(:,:,0)
    wz = fi->wz(:,:,0)
;--------
    wks =gsn_open_wks("x11","test")
    gsn_define_colormap(wks,"BlWhRe")
        res = True
        res_at_gsnDraw = False
        res_at_gsnFrame = False
        res_at_gsnPaperOrientation = "portrait"

        res_at_cnFillOn = True ; turn on color for contours
        res_at_cnLinesOn = False ; turn off contour lines
        res_at_cnLineLabelsOn = False ; turn off contour line labels
        res_at_gsnSpreadColors = True ; use full color map

        res_at_tmXTOn = False
        ;res_at_tmYROn = False

        res_at_tiYAxisOn = False
        res_at_tiXAxisOn = False

        res_at_tmYRMode = "Automatic"
        res_at_lbLabelBarOn = False
        res_at_cnInfoLabelOn = False
        res_at_gsnSpreadColors = True

        res_at_vcGlyphStyle = "CurlyVector" ; turn on curley vectors
        res_at_vcVectorDrawOrder = "PostDraw" ; draw vectors last

        minmax=(/ min( uz) , max(uz) /)
        symMinMaxPlt(minmax,10,False,res)
       plot= gsn_csm_pres_hgt_vector(wks,uz,vz,wz*(100.),res)
       ;plot= gsn_csm_pres_hgt(wks,uz,res)

            getvalues plot_at_contour
                    "pmAnnoManagers" : am_ids
            end getvalues

            index = ind(NhlName(am_ids).eq."right_axis")
            if(.not.ismissing(index)) then
            NhlRemoveAnnotation(plot_at_contour,am_ids(index))
            end if

       draw(plot)
       frame(wks)
end
                                 
Best whishes,
Li
2008-10-28

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