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

begin
  years  = ispan(1850,1870,1)
  nyears = dimsizes(years)
  arr    = random_uniform(-4.,4.,nyears)

  wks = gsn_open_wks("x11","tm")

  res           = True

  res@gsnMaximize = True
  res@vpWidthF    = 0.8     ; make the plot wider than it is high
  res@vpHeightF   = 0.3

  res@trXMinF     = min(years)
  res@trXMaxF     = max(years)
  res@trYMinF     = -4.5
  res@trYMaxF     =  4.5

  plot = gsn_csm_xy(wks,years,arr,res)  ; X axis tickmark labels start at 1950, not 1949

  res@tmXBMode        = "Manual"
  res@tmXBTickStartF  = res@trXMinF   ; Force tickmark labelling to start at first value

  plot = gsn_csm_xy(wks,years,arr,res)

end