Excel automatically distributes these points along a uniform X axis. To add more data to the Y axis in a line chart, add additional numbers in cells below your existing data.

Charts enable your company to display in compelling graphical format the contents of its Excel worksheets. Whether you've created a chart without a legend or deleted a legend from an existing ...

In Microsoft Excel, to draw attention to a specific marker in a line chart, drop in a thin line, think of it as a marker.