Question about palette

[du hui <bjduhui@xxxxxxxxxxx>]

Hi, I have a question.
I am trying to plot some data and compare it with others plot. What I want 
is to represent the same varialbe value with the exactly same color. 
Unfortunately, I have no detailed information about how the plot with which 
I want to compare my plot map the color. 
For example, I want to plot wind speed. The present plot has the values 
from -5m/s to 5m/s. 
however my wind speed values range from -9m/s to 9m/s. How can I produce 
the plot with the same color representing the same value. 
I think the present plot's palette is by percent.
Anybody can give me some hints. 
Thanks a lot

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