This is a 2D scatter graph whose XY coordinates are plotted in the order the data are present in the source worksheet.
In this chart type, the markers represent groups of data objects.
This chart supports important exploratory features, e.g., walking through the hierarchy of data for step-wise exclusion and re-inclusion of data,
generating a subset of data on the fly from selected data points, data brushing, etc.
An XY Scatter Chart Displaying Two Groups of Data Objects
An XY Scatter Chart Displaying Major Axis Density Ellipses