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`area=90/-180/-90/180`
`area=75/-25/10/60`	`area=75/-15/30/42.5`
`area=73.5/-27/33/45 (equivalent to area=E)`	`area=40/-20/-40/60`
`area=50/-135/-60/-30`	`area=40/60/-60/180`
`... area=74/60/10/-20, grid=1/1, frame=3, ...`

specifies a frame three grid points wide with the outer limits 74/60/10/-20 and inner limits 72/58/8/-18.

For observations, the area keyword is used as a filter.

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