x-axis tick mark labels in contour plot

Hi,

I am trying to do a contour plot. The data is two dimension. The y-axis is altitude and x-axis is latitude. My y-axis tick marks gets labled properly. However my x-axis tick marks lables are written one on top of the other (please see attached figure). I tried all possibilities and could not figure out. I would appreciate your help here.

Here is the part of my program that I use to lable my tick marks.

;---Tickmark resources

  latstep = 73
  res@tmXBMode = "Explicit"

  res@tmXBValues = lat1d(::latstep)

  res@tmXBLabels = sprintf("%5.2f",lat1d(::latstep)) + "~C~" + \

                             sprintf("%5.2f",lon1d(::latstep))

  res@tmXBLabelFontHeightF = 0.01

  res@tmEqualizeXYSizes = True ; make sure labels same size

Thanks in advance.

Starry

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