How can I utilize the full area of a non-square output device

Dear NCL users:
If I want to panel 15 square plots by 5(columns)x3(rows) to an 500x300 png image file. Is there a way that I can fill the whole area of the image instead of draw the plots to a 300x300 area in the center?
Perhaps It's impossible, because the explanations for the glossary "NDC" contains:
"NDC space will be mapped onto the largest square which will fit on an actual plotting device."

Regards
Jiapeng
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Received on Sat Mar 24 01:03:17 2012