ShadeLtContour not working!!

Dear NCL,

I just wonder why the "ShadeLtContour" function in my code
is not working. I want to shade my plot if the contour less than 1.

Here is my plot:

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
  f = addfile("ly.nc","r") ; Read in first time step and
  T = f->ly(:,:,:)

 ;T = T(lev|:,time|:,lat|:)

  T = where(T.lt.0, 0, T)

  ;printVarSummary(TEMP)

;*******************************************************************************

  wks = gsn_open_wks ("x11", "annualzonalmean" ) ; open
workstation

  res = True ; plot mods desired
  res@cnLineLabelsOn = True ; turn on line labels
  res@cnFillOn = False ; turn on color fill
  res@cnMonoFillColor = True
  res@gsnLeftString = " "
  res@gsnRightString = " "
  res@gsnCenterString = " "
  res@gsnContourZeroLineThicknessF = 0
  res@cnLevelSpacingF = 1
  res@cnMonoFillPattern = True
  res@cnInfoLabelOn = False

;*******************************************************************************
;changing aspect ratio

 ;res@vpXF = 0.13 ; change x-scale
 ;res@vpWidthF = 0.75 ; change height and
width
 ;res@vpHeightF = 0.45

 plot = gsn_csm_contour(wks,T(1000,:,:),res)
 plot = ShadeLtContour(plot, 1, 3)

 end

thank you

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Received on Thu Jun 27 08:48:57 2013