; ===========================================
; hov_1.ncl
; ===========================================
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"

begin
;=============================================
; data processing
;=============================================
 fili  = "chi200_ud_smooth.nc"                 ; filename
 
 f     = addfile (fili , "r")                  ; add file
 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 = "Default Hovmueller"       ; title
 plot = gsn_csm_hov(wks, chi, res )            ; default hovmueller
end