Rules are paragraph attributes that move and are resized along with the paragraph on the page. If you’re using a rule with headings in your document, you may want to make the rule part of a paragraph style definition. The width of the rule is determined by the column width.
The offset for a rule above a paragraph is measured from the baseline of the top line of text to the bottom of the rule. The offset for a rule below a paragraph is measured from the baseline of the last line of text to the top of the rule.