How do I go about showing the region of integration represented by a repeated integral? (Just for 2 dimensional functions)(adsbygoogle = window.adsbygoogle || []).push({});

All the diagrams I've seen show the area under the graph, but with like 2 bars across it. I don't understand what all this represents and my poor quality notes are of absolutely no help whatsoever.

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# Multiple Integrals

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