Each contour level line has its own properties. You can access these properties through Contour level properties in the contour property sheet by clicking Contour level properties, clicking on the arrow button, and then clicking Edit... The Contour Levels property sheet will appear.
The first column of the Contour Levels property sheet contains the property values for all the levels. In this column, change the Label setting from
Value. The value of each contour line appears as labels in the iContour display.