<div dir="ltr"><div><div>Hello...<br><br></div>Could you please tell me how to control the contour interval for color shading once im using this function  <b>gsn_csm_vector_scalar_map</b>.<br></div><br>;===========PLOT=================<br><br>  wks = gsn_open_wks(&quot;png&quot;,&quot;overlay&quot;)<br><br>  res                       = True              ; plot mods desired<br>  plot = new(16,graphic)<br><br>  res@gsnDraw             = False           ; don&#39;t draw<br>  res@gsnFrame            = False           ; don&#39;t advance frame<br><br>; vector rescoures<br>  res@vcRefLengthF             = 0.045<br>  res@vcRefMagnitudeF          = 20.0<br>  res@vcRefAnnoOrthogonalPosF  = -0.12<br>  res@vcRefAnnoParallelPosF    =  0.997<br>  res@vcRefAnnoFontHeightF     = 0.015<br>  res@vcMinDistanceF          = 0.03<br>  res@lbLabelBarOn        = False    <br><br>  res@mpProjection   = &quot;AzimuthalEquidistant&quot;  ; choose map projection<br>  res@mpLimitMode    = &quot;LatLon&quot;          ; use lat/lon coordinates to limit area<br>  res@mpMinLatF      = 25.<br>  res@mpMaxLatF      = 75.<br>  res@mpMinLonF      = -80.<br>  res@mpMaxLonF      = 20.<br>  res@gsnMaximize           = True   <br><br><b>  res@gsnScalarContour        = True<br>  res@cnFillOn                = True<br>  res@cnFillPalette           = &quot;gui_default&quot;     ; set color map<br>  res@cnLinesOn               = False             ; turn off contour lines<br></b><br><br><br>  do i=0,15<br>  plot(i)  = gsn_csm_vector_scalar_map(wks,u(i,:,:),v(i,:,:), \<br>                                   p(i,:,:),res)<br>  end do<br><br>  resP                     = True                ; modify the panel plot<br>  resP@gsnMaximize           = True   <br>  gsn_panel(wks,plot,(/4,4/),resP)               ; now draw as one plot<br><br><br>end<br><br><br></div>