How to put user specified variable name in "wrf_PressureLevel3.ncl" example plot

Hi,

I am trying to plot pressure level plot from WRF output using
(http://www.mmm.ucar.edu/wrf/OnLineTutorial/Graphics/NCL/Examples/LEVELS_INTERP/wrf_PressureLevel3.ncl). I have replaced the "relative humidity" variable by "specific humidity" variable but having problem to replace the "long name" of the variable. Although I have declared the variable_at_long name = "Specific Humidity" it is showing "unknown" at 500 hPa. I am attaching the plot for your
convenience.

Thanks
Kamal

=====================================================================
     sh = wrf_user_getvar(a,"QVAPOR",-1)
     sh_plane = wrf_user_intrp3d(sh,p,"h",pressure_levels,0.,False)

     q0 = sh_plane/(1+sh_plane)
     q0 = q0*1000 ; g/kg

     q0@long_name = "Specific Humidity"
     q0@units = "g/kg"

       ; Plotting options for SH
         opts = res
         opts@cnFillOn = True
         opts@pmLabelBarOrthogonalPosF = -0.1
         opts@ContourParameters = (/ 5., 4., 3., 2., 1./)
         opts@cnFillColors = (/"White","White","White", \
                               "White","Chartreuse","Green",\
                               "Green3","Green4", \
                               "ForestGreen","PaleGreen4"/)
         contour_sh = wrf_contour(a,wks,q0(it,level,:,:),opts)
         delete(opts)
======================================

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