specific lebels for Histograms

Dear all, I am trying to put specific levels to a histogram but when I
run my program it just appear the first lebel and no the others and in
my prompt does not say any warning or error. Here is what I am doing:

Thanks
carlos

wks = gsn_open_wks("x11","histo") ; open workstation
  gsn_define_colormap(wks,"temp1") ; choose colormap

  res = True
  res_at_tmXBLabelStride = 3
  res_at_tmXBMode = "Explicit" ; define own tock marl lebels
  res_at_gsnHistogramDiscreteBinValues = ispan(0,23,1)
  res_at_tmXBLabelAngleF = 300.
  ;res_at_tmXBValues =(/0,3,6,9,12,15,18,21/) ;LOcation of explicit
labels
  ;res_at_tmXBLabels = (/"0-5 P.M.","3-8 P.M.","6-11 P.M.","9-2
A.M.","12-5 A.M.","15-8 A.M.","18-11 A.M.","21-2 P.M."/)
  res_at_tmXBMinorOn = False ; No minor tick marks.
  res_at_tmXBLabelJust = "CenterCenter" ; label justification
  res_at_tmXBLabelFontHeightF = .03 ; Font size

  plot =gsn_histogram(wks,hour,res); create histogram with 10 bins

-- 
Carlos Manuel Minjarez-Sosa <minjarez_at_jet.atmo.arizona.edu>
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