[ferret_users] add a subregion box to an existing ferret plot?

[Haoping Yang <haoping.yang@xxxxxxxx>]

Dear ferreters,

I am trying to add a box to a ferret plot to show a subregion. For 
example, I have a SSH plot for gulf of mexico ranged from 98W to 76W and 
18N to 32N. Now I want to add a bold dashline box to the existing SSH 
plot showing a subregion (94W:84W, 22N:29N), namely, a box containing 
four straight dashlines in bold. Could anyone please teach me how to do it?

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Thank you,
Haoping