[gradsusr] How can I get ther gxout barb to work

[João Teixeira]

Hi there,
I made a script to calculate the geostrophic wind in a certain level, 
and fixed point off my grid (in attachment).
Now I would like to make a fancy display off it, like wind barb's, but 
all I can display is a line graph...
I already try to use set gxout barb and /set gxou||||/|/t tserbarb/, 
with out any success.
Does anybody know how to get the graphic to work.
The data is varying in time for a simgle point (1-D)
Thanks

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