Use this tab to specify the size of the triangular marker for the center of a grading. 
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Size
 
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Specifies the size of the marker and how it is calculated: 
-  Percentage Of Screen: Marker size is a fixed percentage of the size of the drawing window, and resizes for the current zoom level. Default option. 
 
-  Plotted Size: Marker size is based on the current drawing scale (inches or millimeters). 
 
-  Fixed Size: Marker size is specified in the current drawing units (usually feet or meters).