Boxplot resources

Hi NCL,

I created a box plot comparing annual and seasonal changes in precipitation
projections (plot attached).

I want to know if I can fill the boxes red and green. What is the plot
resource that does this?

I also want to draw a box around {black and red} and {blue and green}
boxes, so that they are grouped together for increased emphasis.

The relevant code section is attached.

Thanks in advance for your help,

;***************************************************************************

  patSeasons = (/0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19/)
  wks = gsn_open_wks(type,diro + "pr_change_2150_boxplot") ;
create postscript file

  ;------------ resources for plot background
  res =
True ; plot mods
desired
  res@tmXBLabels = (/" ","Ann"," ","DJF"," ","MAM"," ","JJA"," ","SON",\
                                 " ","Ann"," ","DJF"," ","MAM"," ","JJA","
","SON"/) ; labels for each box, Jan-Dec
  res@tmXBLabelFontHeightF = 0.01
  res@trYMinF = -25.0
  res@trYMaxF = 25.0
  res@vpHeightF = 0.3
  res@vpWidthF = 0.7

  ;------------ resources for polylines that draws the boxes
  llres = True
  llres@gsLineThicknessF = 2.5 ; line thickness

  ;------------ resources that control color and width of boxes
  opti = True
  opti@boxWidth = .8 ; Width of box (x
  opti@boxColors =
(/"black","red","black","red","black","red","black","red","black","red",\

"blue","green","blue","green","blue","green","blue","green","blue","green"/)

  plot = boxplot(wks,patSeasons,patArrSeason,opti,res,llres)

  draw(wks)
  frame(wks)

;*****************************************************************************

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