There is an Identify tool on the toolbox that can be used to view the X and Y coordinates. This tool looks like a set of crosshairs. You can also use the Identify tool to add a value label by pressing Option (Mac) or Alt (Windows) when clicking on the plot.
KaleidaGraph is a thoughtfully designed graphing and data analysis application for research scientists, as well as for those in business and engineering fields. It produces publication-quality graphs, and easily converts the most complex data into a functional display.