stretch the Y axis

Hi, all
   These days I draw a very ugly picture which starts from 30N to 60N in
latitude and 0 to 360 in longitude, it meridionally compressed so hard that
it¡¯s not easy to clearly make out what happened in that zonal belt.
   I have attached the picture in the accessory. My ncl script have been
pasted in below! Would anyone teach me how to stretch the Y axis to make
the picture more beautiful?

;***************************************************
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/csm/shea_util.ncl"

begin
  wks=gsn_open_wks("pdf","fig1")
  gsn_define_colormap(wks,"BlWhRe")
  
  dims=(/37,144/)
  Ius = new(dims,"float")

  pathIus = "4kl.grd"
     
   Ius = fbindirread(pathIus,0,dims,"float")
   
   lon=fspan(0,357.5,144)
   lat=fspan(0,90.0,37)
   lon_at_units="degree_east"
   lat_at_units="degree_north"
   Ius!0="lat"
   Ius!1="lon"
   Ius&lon=lon
   Ius&lat =lat
   Ius@_FillValue=32766.0

res = True
res_at_gsnMaximize = True
res_at_vpWidthF=0.65 ;& for the map &
res_at_vpHeightF=0.65 ;& to be draw
  
res_at_mpFillOn = False
res_at_mpMinLatF = 30
res_at_mpMaxLatF = 60
res_at_mpCenterLonF =180

res_at_tmXTOn=False ;close the top X axis
res_at_tmYROn=False ;close the right axis
  
res_at_tmXBTickSpacingF=60
res_at_tmYLTickSpacingF=10
  
res_at_tmXBMinorOn=False
res_at_tmYLMinorOn=False

res_at_tmXBMajorLengthF=0.01
res_at_tmXBMajorOutwardLengthF=0.01
res_at_tmXBLabelDeltaF=-0.6
res_at_tmXBLabelFontHeightF=0.018
res_at_tmXBLabelFontThicknessF=1.5

res_at_tmYLMajorLengthF=0.01 ;modify the length
res_at_tmYLMajorOutwardLengthF=0.01 ;& of axis outward part
res_at_tmYLLabelDeltaF=-0.6 ; move the axis label closer to the
axis
res_at_tmYLLabelFontHeightF=0.018
res_at_tmYLLabelFontThicknessF=1.5
  
res_at_tmYLLabelStride=1
  
res_at_tmXMajorGrid =True
res_at_tmXMajorGridThicknessF =0.5
res_at_tmXMajorGridLineDashPattern = 2

res_at_tmYMajorGrid =True
res_at_tmYMajorGridThicknessF =0.5
res_at_tmYMajorGridLineDashPattern = 2

res_at_cnFillOn = True
res_at_cnLinesOn = False
res_at_cnLineLabelsOn = False
res_at_cnInfoLabelOn = False
res_at_cnLevelSpacingF = 0.05
res_at_cnSmoothingOn = True
  
res_at_gsnSpreadColors = True
res_at_gsnSpreadColorStart = 3
res_at_gsnSpreadColorEnd = -1

res_at_gsnAddCyclic = True
  
res_at_lbBoxSizing = "UniformSizing"
res_at_lbOrientation = "Vertical"
res_at_lbLabelFontHeightF =0.018
res_at_lbBoxLinesOn = False
res_at_lbBoxMinorExtentF = 0.2
res_at_lbLabelStride = 10

res_at_lbLeftMarginF = 0.01
res_at_lbAutoManage = False
res_at_lbLabelJust = "CenterRight"

plot=gsn_csm_contour_map(wks,Ius({30:60},:),res)
  end

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