Sparkline Tools -> Design->Show -> Markers Sparkline: Data Markers Markers are data points. You can format the points to draw attention to the data.   Before You Begin: Click once on the Sparkline so that it is selected. The Sparkline Tools should be available. Go to Sparkline Tools->Design->Type. Click on Line.   5. Try This: Show the Markers Go to Sparkline Tools -> Design->Show.. Click on Markers.   What Do You See? The Markers include: High Point Low Point Negative Points First Point Last Point   Keep going...