Your data can be placed in up to six groups, each of which will receive its own coloring.
This feature can be used to differentiate data. For instance, you can group data to highlight information that comes from different sources, represents different populations or time periods, or is otherwise distinct from other data points.
To group data, you add a fifth element to each row of the data file. This entry contains a name for the group. The name can be anything, but once groups are used, each data point must contain a group label.