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Select one Z column (or a range from one Z column). If the Z column has an associated X column, then the X column is used; otherwise, the worksheet's default X values are used.
Select required data.
From the menu, choose .
or
Click the Contour &endash Color Fill button on the 3D and Contour Graphs toolbar.
TRICONTOUR.OTP (installed to the Origin program folder).
The Z values determine a surface of X and Y grid lines. This plot does not require a matrix; data is plotted directly from the worksheet. To set contour plot boundaries, open the Plot Details dialog and go to the Contouring Info tab.