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A three dimensional plot that shows a curved surface above a triangle with vertices at (0,0), (4,0), and (0,4). This curved surface has its lowest value approaching the vertex at (0,4) and has a relative maximum on each of the sides connecting (0,4) to the other vertices. The boundary of the surface along the edge from (0,0) to (4,0) is an upward pointing U-shape. The border of the surface is highlighted in teal.