axes for contour plot

Hi All,
I want to make a contour plot for an array(12,30) with 12 months and
30 years data. How can I apply Jan-Dec for months and say 1951-1980
for years the axis?
Now I am having only 1-12 for months and 1-30 for years on the axis.

my code is like this:

 wks = gsn_open_wks ("X11","QTano")
 gsn_define_colormap(wks,"BlueRed")

  res = True
  res@cnFillOn = True
  res@cnLevelSelectionMode= "ManualLevels"
  res@cnMinLevelValF = -0.3
  res@cnMaxLevelValF = .25
  res@cnLinesOn = False
  res@gsnSpreadColors = True

  res@lbLabelAutoStride = True
  res@gsnMaximize = True
  res@tiYAxisString = "Month (Jan to Dec)"
  res@tiXAxisString = "Year (1951-2080)"

 month =(/1,2,3,4,5,6,7,8,9,10,11,12/)
  plot = gsn_csm_contour(wks,MTano,res)

Thanks in advance.
Bithi

-- 
Bithi De
Graduate Student , Research Assistant
International Arctic Research Center , University of Alaska Fairbanks
Fairbanks , Alaska -99775
USA
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