change the ration of width and hight of map

Namba Takaya <[email protected]>
Newsgroups gmane.comp.gis.gmt.user
Message-ID <[email protected]>
Dir sir
I wish to make the map with the different ration of width and hight.
pscoast -R0/10/-60/-50 -Jm1c -P -W -Dh -B -O  > map.eps
Could you tell me how to change the ratio of the map?
regards,
takaya
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