Activate the matrix sheet or select required data from worksheet.
From the menu, choose Plot >2D : Contour: Contour - B/W Lines + Labels.
Click the Contour - B/W Lines + Labels button on the 3D and Contour Graphs toolbar.
(Installed to the Origin program folder).
Contour plots from worksheet supports user-defined boundaries. To set contour plot boundaries, open the Plot Details dialog and go to the Contouring Info tab.