Long description: Fig361c
Alt text: A diagram labeled "surface" shows a rectangle with dimensions labeled "a" for the height and "b" for the width, and coordinate axes labeled "x" and "y" at opposite corners.
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- The image displays a schematic representation labeled "surface," which is depicted as a two-dimensional rectangular area.
- The vertical dimension of the surface is labeled with the letter "a".
- The horizontal dimension of the surface is labeled with the letter "b".
- The bottom-left corner of the surface has a vertical arrow labeled "y," indicating the vertical axis.
- The top-right corner of the surface has a horizontal arrow labeled "x," indicating the horizontal axis.
- Inside the rectangular surface, there is a vertical double-line box, positioned near the left edge, representing a specific region on the surface.