;*************************************************
; font_3.ncl
;
; Concepts illustrated:
;   - Increasing the font size of tickmark labels in a map plot
;   - Setting the longitude spacing for map tickmarks
;
;************************************************
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"  
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"  
;************************************************
begin
;************************************************
; read in netCDF file
;************************************************
  a = addfile("atmos.nc","r")
  data = a->VT(0,5,:,:)                                
;************************************************
; create default plot
;************************************************
  wks = gsn_open_wks("ps","font")                  ; open a ps file
  gsn_define_colormap(wks,"wgne15")

  res                 = True                      ; plot mods desired
  res@cnFillOn        = True                      ; turn on color

;---This resource not needed in V6.1.0
  res@gsnSpreadColors = True                      ; use full colormap

  res@lbOrientation   = "Vertical"                ; vertical label bar

  plot = gsn_csm_contour_map_ce(wks,data,res)     ; create plot

; now change the size of the tickmark labels
  res@tmXBLabelFontHeightF = 0.02                 ; resize tick labels
  res@tmYLLabelFontHeightF = 0.02    

; change label spacing to avoid overlap  
  res@lbLabelStride    = 2                        ; every other label
  res@tmXBTickSpacingF = 60.                      ; every 60 degrees 
  plot = gsn_csm_contour_map_ce(wks,data,res)     ; create plot

end