Represents a series in the specified chart. The Series object is a member of the 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 series one in the chart. 

myChart.SeriesCollection(1).Interior.Color = RGB(255, 0, 0)

The series index number indicates the order in which the series are added to the chart. 

SeriesCollection(1)
is the first series added to the chart, and 
SeriesCollection(SeriesCollection.Count)