TChart problem

The following chart shows the result of using TPointSeries

This is an altitude profile and shows that there is an upper trace (see top right half of chart) and a lower trace (bottom left) in the source data. The data is entered into the Series in the order collected and I would like to see lines connecting the points.

The following chart shows the result of using TLineSeries.

The points are connected in ascending x-axis order and not in the input order. This produces the zig-zag connection which is not what is desired.

I want a TPointLineSeries that is a hybrid of these 2 series and connects the points in the order entered.