Use the Intersect gadget to calculate the intersection points of the input curves in the ROI. This gadgt is available in the Gadgets menu when a graph window is active.
Specify how to display the intersection points.
Select to mark the intersection with symbols. Color, shape and size of symbols can be customized.
Check this check box to add labels for the intersections.
Click the triangle button at the top right corner of the ROI tool to open the menu. Menu commands include: