Common Xlabel with gsn_attach_plots

Ncl users,

I used "gsn_attach_plots" to concatenate two plots.

But I don't know how to use common xlabel for the two plot.

I am trying to remove the line between the two plots?

Which part of my script can I touch to adjust my plot?

Thanks

;=================================================;
; PLOT
;=================================================;
  wks = gsn_open_wks("eps", fili(n)) ; open a ps file

       gsn_define_colormap(wks, "gsltod")
    i = NhlNewColor(wks, 0.7, 0.7, 0.7) ; add gray to colormap
    setvalues wks
    "wkColorMap" : "gsltod"
    "wkForegroundColor" : (/0., 0., 0./)
    "wkBackgroundColor" : (/1., 1., 1./)
    end setvalues

; gsn_define_colormap(wks,"gui_default") ; choose a colormap

res = True

    res_at_gsnDraw = False ; don't draw yet
    res_at_gsnFrame = False ; don't advance frame yet
   
    res_at_cnFillOn = True ; turn on color
    res_at_gsnSpreadColors = True ; use full range of colormap
    res_at_cnInfoLabelOn = False
    res_at_cnInfoLabelPerimOn = False
    res_at_cnLinesOn = False

; res_at_cnLevelSelectionMode = "AutomaticLevels" ; set manual contour levels

    res_at_gsnSpreadColors = True ; use full color map
    res_at_gsnSpreadColorEnd = -3 ; don't use added gray
    res_at_lbOrientation = "Vertical" ; vertical label bar

    res_at_pmLabelBarOrthogonalPosF = -0.01 ; move label bar closer
    res_at_lbLabelStride = 1
    res_at_cnLevelSelectionMode = "ManualLevels" ; manual levels
    res_at_cnMinLevelValF = 2
    res_at_cnMaxLevelValF = 34
    res_at_cnLevelSpacingF = 4
    res_at_lbLabelFontHeightF = 0.02

    res_at_lbOrientation ="vertical" ; vertical label bar

    res_at_tmXTMode = "Automatic"
       
    res_at_tmXBMode = "Explicit" ; label independently
    res_at_tmXBValues = (/2, 6, 10, 14, 18, 22, 26, 30, 34, 38, 42, 46/)
    res_at_tmXBLabels = (/"12", "14", "16", "18", "20", "22", "00", "02", "04", "06", "08", "10"/)

    res_at_tmXBMode = "Explicit" ; label independently
    res_at_tmXBValues = res_at_tmXBValues
    res_at_tmXBLabels = res_at_tmXBLabels

   
    res_at_tiMainString = " " ; add titles
    res_at_tiXAxisString = "LST"
    res_at_tiYAxisString = "Distance (Km)"
   
    res_at_tiMainFontHeightF = 0.05 ; change font heights
    res_at_tiXAxisFontHeightF = 0.015
    res_at_tiYAxisFontHeightF = 0.015
       
    res_at_gsnLeftString = " " ; add the gsn titles
    res_at_gsnCenterString = " "
    res_at_gsnRightString = " "

    res_at_tmXUseBottom = False ; Keep top axis independent of bottom.
    res_at_tmXBLabelsOn = True ; have tick mark labels
    res_at_tmXTLabelsOn = False ; have tick mark labels
    res_at_tmXTOn = False ; no bottom tickmarks
    res_at_tmXBLabelFontHeightF = 0.018
    res_at_tmBorderThicknessF = 3.0

    res_at_tmYROn = False
    res_at_tmYRBorderOn = False
    res_at_tmYRLabelsOn = False

    plot = gsn_csm_contour(wks, data, res) ; contour the variable

    res_at_tmYLOn = False
    res_at_tmYLBorderOn = False
    res_at_tmYLLabelsOn = False
  
    res_at_tmYROn = False
    res_at_tmYRBorderOn = True
    res_at_tmYRLabelsOn = False

    plot1 = gsn_csm_contour(wks, data, res) ; contour the variable
       
    newplot = gsn_attach_plots(plot, (/plot1/), res, res)
   
    draw(plot)
    frame(wks)

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