Overline

Draw a rule above a cramped math operand while keeping its baseline. This is the direct counterpart of \overline{…}.

Property	Default	Meaning
children	Empty	Overlined operand.
thickness	TeX rule thickness	Nonnegative line thickness.
fill	Inherited color	Optional rule paint.

thickness defaults to the active style's TeX rule thickness. The rule spans the body's advance, with a gap of three thicknesses and one extra thickness above the line. fill changes only the rule; color changes the expression. Zero thickness omits the rule and its padding. The result is an ordinary atom.

Use Accent with accent="bar" for a short fixed accent, or Underline for a rule beneath the body.