overlay graph on stack section

i want to overlay graph on stack section , but there are problem with color. this is my script:

awk '{print $2,$1}' ofsettTWT2.data > data &&
a2b n1=2 < data > data.bin &&
psgraph n=537 x2beg=0 d2num=0.0 x2end=13000 x1beg=0 x1end=5 < data.bin linewidth=0 marksize=8 style=seismic wbox=20 hbox=10 linecolor=red > data.ps &&
convert data.ps data.png &&
supsimage < stack.su width=20 height=10 perc=98 x2beg=0 key=sx f2=0 d2num=0.0 x2end=13000 x1beg=0 x1end=5 threecolor=1 wrgb=0,0.35,1 grgb=0.35,1,0 brgb=1,0.35,0 d1s=0.5 d2s=0.5 > Stack.ps &&
psmerge in=Stack.ps in=data.ps > Stack_fix.ps &&
convert Stack_fix.ps Stack_fix.png

image Stack_fix.png and suximage < stack.su don't have same color. color of Stack_fix.png blocky. How to make script in order to be (psfile.ps) can be ploted interactively at suximage....so i can change color interactively (press h or r)................( example, suximage < data.su psfile.ps.................. )

thx...
indah