A surface plot represents the dependent quantity z, which depends on the two independent variables x and y, as a surface whose height indicates the value of z.

The previous figure is a perspective drawing of a surface representing the Bessel function` J0(r)`

, where` r`

is the distance from (x=0, y=0). The height of the surface shows the value of J0, given on the vertical axis (unlabeled in this figure, but usually called` z)`

. The other two (unlabeled) axes defining the plane above which the surface is drawn are the* x* and* y* axes.

The following code listing is the script that coaxed gnuplot into making the previous figure: ...

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