When layered compression is used, the main graph plotting area is reduced in size to leave space for Margin Graphs in the upper and right side of the display (and a miniature graph in the corner). These smaller Margin Graphs represent vertically and horizontally compressed images (respectively) of the main graph.
For more information on Layered Compression (and an additional example), see
Special Topics in Graphical Analytic Techniques: Layered Compression.
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