mirror line
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The dotted line between two connectors indicates a relationship. The relationship is not a permanent one, hence the line is dotted rather than solid.
you fold it where the dotted line is
The line is dotted when the inequality is a strict inequality, ie it is either "less than" (<) or "greater than" (>). If there is an equality in the inequality, ie "less than or equal to" (≤), "greater than or equal to" (≥) or "equal to" (=) then the line is drawn as a solid line.
A dashed/dotted line if it is > or <. Otherwise use a regular line. Also shading is required.
The LINE of symmetry