The Contour Plot Launch Window
Columns assigned to the Y role are used as variables to determine the contours of the plot. You must specify at least one, and you can specify more than one.
Columns assigned to the X role are used as the variables for the x- and y-axes. You must specify exactly two columns for X.
Most often, you construct a contour plot for a table of recorded response values. In that case, Use Table Data is selected and the Specify Grid button is unavailable.
However, if a column has a formula and you specify that column as the response (Y), the Specify Grid button becomes available. When you click Specify Grid, you can define the contour grid in any way, regardless of the rows in the existing data table. This feature is also available with table templates that have one or more columns defined by formulas but no rows.
After you click OK, the Contour plot appears. See The Contour Plot.