changing batch parameters for xmgrace

I am using gracebat of xmgrace to generate images based on xvg inputs: gracebat input.xvg -hdevice PNG -nosafe -printfile ouptut.png -hardcopy -batch grace.bfile and here is my batch file s0 line type 0 s0 type BAR s0 line color 4 HARDCOPY DEVICE \"PNG\" PAGE SIZE 800, 600 xaxis label char size 2.50000 yaxis label char size 2.50000 xaxis ticklabel char size 2.000000 yaxis ticklabel char size 2.000000 Briefly it produces what I need but I would like to customuze in the batch.file design of the bar graphs. How it could be possible to set blue background for each bar (presently it is white) as well as to increase the thickness of the black line of the outline of each bar?