[gradsusr] How to make for the scale in Grads the same for different plots?

[Mekonnen Adnew]

Hi Grads users:
I am comparing seven model experiments using grads software. To do so I want to make the scale the same, but I faild to adjust the scale the same for all model experiments. 
Thank you for your help.
Mekonnen Adnew Degefu
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