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buttons under the graph allow various manipulations of
the graph coordinates.
- The text input fields
marked "x=f(u,v)=", "y=g(u,v)=",
a wide variety of expressions to represent functions.
- The text input fields marked "u=" and
"v=" can accept any decimal numbers.
- The "Grid" button provides a pop-up window which
allows changes to the bounds and spacing of the coordinate grid shown
in the left graph, and the transformed grid in the right graph.