;================================================;
;  conwomap_2.ncl
;================================================;
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"   
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"   
; ================================================;
begin
;=================================================;
; open file and read in data
;=================================================;
  f    = addfile("cone.nc","r")
  u  = f->u(4,:,:)                
;=================================================;
; PLOT 2
;=================================================;
  wks  = gsn_open_wks("ps","conwomap")    ; open a ncgm file
  gsn_define_colormap(wks,"gui_default")  ; choose a colormap

  res                     = True          ; plot mods desired

  res@cnFillOn            = True          ; turn on color
  res@gsnSpreadColors     = True          ; use full range of colormap
 
  res@vpWidthF            = 0.5           ; change aspect ratio of plot
  res@vpHeightF           = 0.3

  plot = gsn_csm_contour(wks,u,res)       ; contour the variable

; In this file, the coordinate variables of the data are listed as 
; lat and long, but they are really just index points, which makes this
; data suitable for plotting without a map.
  end