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In the Iso-contour Mode the cursor changes to
HOT 
or COLD 
or EQUAL 
As soon as the left mouse button is clicked into an image, the pseudo-snake algorithm tries finding the largest closed iso-contour at the clicked image value and represents it as a closed polygon.
Note: Each time the button is clicked, the contour is replaced by a new iso-contour. This behavior is in contrast to the other drawing modes which require to first clear a contour, or opening it. To add a new iso-contour make sure you press the control button and the left mouse button simultaneously (CTRL+click)
The user can select the appropriate mode from the option list next to the iso-contour button as illustrated below. The automatic mode of iso-contouring can be 2D or 3D and dependent whether the user is aiming at a hot, cold or equal contour.
