contour diagram A stereographic equal-area net on which orientation data (i.e. the azimuths of structural features) are plotted as lines or points and then joined to form contours linking areas of equal density of data, thus providing a visual description of the range and concentration of the data. There are several ways to construct such diagrams manually or by computer, and there are statistical tests for evaluating the significance of the densities revealed.

contour diagram A stereographic equal-area net on which orientation data (i.e. the azimuths of structural features) are plotted as lines or points and then joined to form contours linking areas of equal density of data, thus providing a visual description of the range and concentration of the data. There are several ways to construct such diagrams manually or by computer, and there are statistical tests for evaluating the significance of the densities revealed.