tmXBValues is not working

Hello,

    I am trying to label x axis by the following two sets of commands.
 However, nothing was labeling on x axis for the first set of commands; The
time range [38881..38973] was labeled on x axis for the second set of
commands. Could anyone indicate the right commands to label x axis?

  res@tmXBMode = "Explicit"
  res@tmXBValues = ispan(0,3,1)
  res@tmXBLabels = (/"Jun","Jul","Aug","Sep"/)

  res@tmXTMode = "Explicit"
  res@tmXTValues = ispan(0,3,1)
  res@tmXTLabels = (/"Jun","Jul","Aug","Sep"/)

    Thanks much,

              Yi-Chih

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Received on Sat Dec 21 16:34:16 2013