Help: About named colors -- Where is "DarkGreen" or "SeaGreen" or "SpringGreen4" ?

Hi,
   Today, I can't get "DarkGreen" "SeaGreen" and "SpringGreen4" when I draw color pictures.
   To simplify my question, I use the following scripts and can't see the color as in http://www.ncl.ucar.edu/Document/Graphics/named_colors.shtml :

;========================================================
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"

begin
  x = ispan(1,100,1)*1.
  y = 50*cos(x*2*3.1415926/30.)

  wks = gsn_open_wks("x11","xy") ; Open an ps workstation.
  res = True
  res_at_gsnYRefLine = 20

  ;res_at_gsnAboveYRefLineColor = "SeaGreen"
  res_at_gsnAboveYRefLineColor = "DarkGreen"
  ;res_at_gsnAboveYRefLineColor = "SpringGreen4"

  plot = gsn_csm_xy(wks,x,y,res)
end
;========================================================
                 
   Can someone hlep me?
                
Best regards,
Li
2007-11-22

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Received on Thu Nov 22 2007 - 07:01:37 MST