Column chart with average line



I’m trying to design a column bar chart (with as much as 5 columns) with a line that represents the average value of the column series.

So I configure my chart with 2 series:

  1. the column bar (SChartColumnSeries)
  2. the average line (SChartLineSeries)

The problem is that, giving the same number of datapoints for both series, the average line starts at the middle of the first column and ends at the middle of the last one, while I’d like it to go from edge to edge.

Any ideas?