When ViewableSeries is set to a value greater than zero, this property selects the first series to appear in the graph.
value = getScrollOffsetSeries();
Is any integer between 0 and the number of viewable groups in the graph. 0 is the default value.
setViewableSeries(4); setViewableGroups(2); setDepthRadius(0); setDataScrollerPresenceGroups(0); setScrollOffsetSeries(1);
Since there are only five series in the data that defines this graph, setViewableSeries(3) and setScrollOffsetSeries(3) results in only two series remaining in the graph.
See DataScrollerPresenceSeries, ViewableSeries, ScrollOffsetGroup.