I think this is a Nemeth situation. Nemeth formatting has precedence over textbook formatting. Please post this over in Math, where you will be advised about relevant Nemeth formatting. THEN if there are formatting issues not covered in Nemeth, textbook guidelines take over. I am not familiar with anything referring to termination of a graphic indicator. I could be having a senior moment, or this could be a Nemeth thing. I know there is often overlap. Please ask at Math first, then come back if there's anything left for textbook to consider.