Represents a series in a chart. The Series object is a member of the SeriesCollection collection.
Using the Series Object
Use SeriesCollection(index), where index is the series index number or name, to return a single Series object. The following example sets the color of the interior for the first series in embedded chart one on Sheet1.
Worksheets("sheet1").ChartObjects(1).Chart. _ SeriesCollection(1).Interior.Color = RGB(255, 0, 0)
The series index number indicates the order in which the series were added to the chart.
SeriesCollection(1) is the first series added to the chart, and
SeriesCollection(SeriesCollection.Count) is the last one added.