<_param name="instructions" type="description" xml:space="preserve">This extension replaces the selection's nodes with numbered dots according to the following options:
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* Font size: size of the node number labels (20px, 12pt...).
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* Dot size: diameter of the dots placed at path nodes (10px, 2mm...).
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* Starting dot number: first number in the sequence, assigned to the first node of the path.
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* Step: numbering step between two nodes.</_param>