When you create a garbage mask, an Axis node and a Geom node are added to the schematic. The Axis node contains rotation, position and scaling data. The Geom node contains information about how the mask will affect the image.
To view the schematic, select Schematic from the World View box or press Esc to toggle between the Schematic view and the previous view.
(a) Axis node (b) Geom node
For information on working with the schematic, see Schematic Basics.