; ===========================================
; hov_6.ncl
; ===========================================
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"

begin
;=============================================
; data processing
;=============================================
  f     = addfile ("chi200_ud_smooth.nc","r")
  scale = 1.e6                                  ; scale factor
  chi   = f->CHI                                ; get chi
  chi   = chi/scale                             ; scale for convenience
;==============================================
; creat plot
;============================================== 
  wks  = gsn_open_wks ("ps", "hov" )            ; open workstation
  
  res                     = True                ; plot mods desired
  res@tiMainString        = "90 deg Spacing"    ; title
  res@gsnMajorLonSpacing  = 90.
  
  plot = gsn_csm_hov(wks, chi, res )            ; draw plot
end