gsnXRefLine

NCL,

I am wondering whethere there is a function that works similar like
res@gsnAboveYRefLineColor or res@gsnBelowYRefLineColor but for gsnXRefLine?
I would like to shade my histogram with gray for the value lower than zero:

e.g.

[SNIP]

res = True
  res@gsnDraw = False
  res@gsnFrame = False
  res@xyLineThicknesses = 2.0
  res@xyLineColors = "blue"
  res@xyMonoDashPattern = False ; all solid
  res@tiYAxisString = "PDF (%) "
  res@tiXAxisString = "PC "
  res@gsnXYBarChart = True ; Create bar plot
  ;res@gsnXYBarChartOutlineOnly = True

  res@trXMinF = -5.0 ; min value on y-axis
  res@trXMaxF = 7.0
  res@trYMinF = 0.0 ; min value on y-axis
  res@trYMaxF = 10.0
  res@vpHeightF= 0.3 ; change aspect ratio of plot
  res@vpWidthF = 0.90

  res@tmXBMode = "Explicit"
  res@tmXBValues = (/-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7/)
  res@tmXBLabels = (/-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7/)
  res@tmXMajorGrid = True
  res@tmXMajorGridThicknessF = 1.0 ; 2.0 is default
  res@tmXMajorGridLineDashPattern = 2 ; select short dash lines
  res@tmYMajorGrid = True ; implement y grid
  res@tmYMajorGridThicknessF = 1.0 ; 2.0 is default
  res@tmYMajorGridLineDashPattern = 2 ; select short dash lines

  res@vpXF = 0.07 ; position and size
  res@vpYF = 0.45

  res@tiMainFontHeightF = 0.018
  res@tmXBLabelFontHeightF = 0.014
  res@tmYLLabelFontHeightF = 0.014

* res@gsnXRefLine = 0.0 *
* res@gsnXRefLineThicknessF = 3.0*
* res@gsnRightXRefLineColor = "red" ; above ref line fill red*
* res@gsnLeftXRefLineColor = "blue"*

  plotD = gsn_csm_xy (wks, xx, yy, res)

---
Thanks
Erika

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Received on Sat Feb 22 03:09:12 2014