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Select Gapping
.
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Select the Line Type row with the priority you want to modify.
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Select Move Item Up
or Move Item Down 
to move the selected row.
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The higher a line type is in the Gapping list, the higher its priority. When two lines intersect, the software makes a gap in the line type with the lower priority.
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When changing the priority of gapping, you can move only one gap row at a time.