This command "fixes" the Z coordinate at a specified
value.

Widget:
- From the Window/Slicer Widget, click on the box next to the Z
coordinate until it displays the word "Fixed". Then, using the
slider bar provided, select the Z location you desire. Or click
until the word "Average" and set the range of the average. Or click
until the word "Free". (For a diagram of the Window/Slicer Widget,
see Producing a 2D Scalar Plot, Producing a 1D Scalar Plot, or Producing a Vector Plot).
Command:
Arguments:
- value: one of the following:
- a number: this fixes the Z coordinate to that value and reduces
the number of coordinates that will be allowed to vary in your
plot.
- "surface": the lowest level of data is plotted.
- "average": an average in Z will be plotted. The range of the
average is the window value in Z (see WINDOW).
- "free" the Z coordinate is no longer locked to one value or an
average, increasing the number of coordinates that will be allowed
to vary in your plot.
Examples:
- ZLOCATION=10
- ZLOCATION=average
- ZLOCATION=surface
- ZLOCATION=free
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Notes: ZLOCATION can only be set to "surface" via the command line.
It cannot be set to "surface" with a widget.