If you create this graph under an analysis and graph outputs are selected you can not modify graphs statistical cutoff lines in SAS EG. But mentioned sgplot is a code process and you can try create the graph specifically using with your output data. But on the task menus left corner there is a "preview code" button and you can add some limited code to related area. If you send a picture of your task menu and explain which task do you use we can help about it. Best, Kemal.
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