white space in every plot

 Hello, could you help me?
 
when I use "gsn_panel" for my four plots, white space in every plot exists ( please refer to attachment).
I don't know how to delete it, but it is very ugly.
 
In additon, in my ncl script I found that "vpWidthF" controls height, and "vpHeightF" controls weight,
so I felt very strange, why? For example, @vpWidthF=1. and @vpHeightF=.6; @vpWidthF=.6 and @vpHeightF=1.
 
my ncl script is as follows:
 
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRFUserARW.ncl"
begin

   ; Read data from WRF output
   fnc = addfile("$HOME/wrfout/exp175MYJ101_nobc/wrfout_d03_2009-10-14_00:00:00.nc","r")
   fnd = addfile("$HOME/wrfout/exp175MYJ101_bc/wrfout_d03_2009-10-14_00:00:00.nc","r")
   bc_E0 = fnc->bc_a01
   bc_E1 = fnd->bc_a01

   ; Open graphics file
   wks = gsn_open_wks("png","sfc_chem_"+varname)
   gsn_define_colormap(wks,"precip3_16lev")
   ; Set up some basic plot resources
   pltres = True
   pltres@PanelPlot = True
   pltres@FramePlot = False
   mpres = True
   mpres@mpProjection = "LambertConformal"
   mpres@mpGridAndLimbOn = False
   cnres = True
   cnres@gsnFrame = False
   cnres@gsnDraw = False
   cnres@InitTime = False
   cnres@Footer = False
   cnres@vpWidthF = 1.
   cnres@vpHeightF = 1.
   cnres@cnFillOn = True
   cnres@cnLinesOn = False
   cnres@cnLevelSelectionMode = "ManualLevels"
   cnres@lbTitleFontHeightF = .025
   cnres@lbLabelFontHeightF = .030

   ; MAKE PLOTS
   opts = cnres
   opts@FieldTitle = "NOBC"
   opts@lbTitleString = "BC (~F33~m~F21~g/kg-dryair)"
   plot = wrf_contour(fnc,wks,dim_avg_n(bc_E0(:,0,:,:),0),opts)
   sfc0 = wrf_map_overlays(fnc,wks,(/plot/),pltres,mpres)

   opts@FieldTitle = "BC"
   plot = wrf_contour(fnc,wks,dim_avg_n(bc_E1(:,0,:,:),0),opts)
   sfc1 = wrf_map_overlays(fnc,wks,(/plot/),pltres,mpres)
  delete(opts)

  opts = cnres
  opts@FieldTitle = "BC-NOBC"
  opts@lbTitleString = "BC Diff (~F33~m~F21~g/kg-dryair)"
  bcdf = bc_E1-bc_E0
  plot = wrf_contour(fnc,wks,dim_avg_n(bcdf(:,0,:,:),0),opts)
  sfc2 = wrf_map_overlays(fnc,wks,(/plot/),pltres,mpres)
  delete(opts)

  opts = cnres
  opts@FieldTitle = "(BC-NOBC)/NOBC"
  opts@lbTitleString = "BC Diff (%)"
  bcdr = (bc_E1-bc_E0)/bc_E0*100
  plot = wrf_contour(fnc,wks,dim_avg_n(bcdr(:,0,:,:),0),opts)
  sfc3 = wrf_map_overlays(fnc,wks,(/plot/),pltres,mpres)
 
   pnlres = True
   pnlres@gsnPanelYWhiteSpacePercent = 0
   pnlres@gsnPanelBoxes = True
   gsn_panel(wks,(/sfc0,sfc1,sfc2,sfc3/),(/2,2/),pnlres)
end
 
Thanks for any help
                                               

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