How Can I Clip a Basemap with an ascii file?

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I'm new here but with many doubts.I work with ArcGIS 10 and I add a basemap layer from the ArcGIS online but I just want the continent coverage to my map,and the area that I wanted I have an ascii file,like a grid.So how can I cut of the ocean part?Is it the "Clip" function the better option?Is there a script for python for this?If someone had a answer please I'll be very grateful.

Thanks.

Nara



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