This enum describes the source it is in, and how this aspect of the data in the series should be used to render the
item. For example, a point in a error-bar plot might have a X value, three Y values (Y, Y_LOW, Y_HIGH), and some
COLOR per item - the three SeriesDataSources all would share the same Axis instance, but would have different
SourceType enums set. The exact meaning of each source type will depend on the series that they are in.
This enum describes the source it is in, and how this aspect of the data in the series should be used to render the item. For example, a point in a error-bar plot might have a X value, three Y values (Y, Y_LOW, Y_HIGH), and some COLOR per item - the three SeriesDataSources all would share the same Axis instance, but would have different SourceType enums set. The exact meaning of each source type will depend on the series that they are in.