Contour Lines

I am trying to generate a gray-scale contour plot without contour lines
on it. I have set the contour lines resource to "False," but they still
show. The odd thing is that they show when "zoomed" to 100%, but not
when "zoomed" to ,for example, 200%. This is a problem for me because i
need to convert the file to a PNG image. When I do that, the lines show
up. Here are a couple screen shots of what I am talking about:

http://narccap.ucar.edu/temp/josht/ncl/Screenshot1.png
http://narccap.ucar.edu/temp/josht/ncl/Screenshot2.png

Here are the resources that I have set in my script:

res = True

res@gsnMaximize = True
res@cnFillOn = True
res@mpFillOn = False
res@cnLinesOn = False
res@gsnSpreadColors = True
res@cnFillMode = "AreaFill"
res@mpOutlineBoundarySets = "NoBoundaries"
res@lbBoxLinesOn = False
res@tiMainString = ""
res@gsnLeftString = ""
res@gsnRightString = ""
res@gsnAddCyclic = False
res@lbLabelBarOn = False
res@lbLabelsOn = False
res@lbPerimOn = False
res@lbTitleOn = False
res@cnLevelFlag = "NoLine"
res@cnLineLabelsOn = False
res@mpPerimOn = False
res@pmTickMarkDisplayMode = "NoCreate"
res@tmXBOn = False
res@tmXTOn = False
res@tmYROn = False
res@tmYLOn = False
res@tmBorderThicknessF = 0.1
res@cnMonoLineThickness = True
res@cnLineThicknessF = 0

res@mpLimitMode = "LatLon"
res@mpMinLatF = 10
res@mpMinLonF = -170
res@mpMaxLatF = 75
res@mpMaxLonF = -30

if (varname .eq. "tas" .or. varname .eq. "temp")
res@cnLevelSelectionMode = "ManualLevels"
res@cnLevelSpacingF = 1.25
res@cnMinLevelValF = 0
res@cnMaxLevelValF = 37.5
end if

if (varname .eq. "prtot" .or. varname .eq. "precip")
res@cnLevelSelectionMode = "ManualLevels"
res@cnLevelSpacingF = 0.6
res@cnMinLevelValF = 0
res@cnMaxLevelValF = 18
end if

The full script is at:
http://narccap.ucar.edu/temp/josht/ncl/plot_ncep.ncl

Thanks for any input!

-Josh Thompson
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Received on Mon Mar 15 12:13:36 2010