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How to create sparse date time line series

I have a CategoryXAxis with many Dates on it (hundreds of thousands of seconds).

I have many series on this timeline, some of which have only a few elements, and some many, but in any case some series do not have values to cover all the dates in CategoryXAxis.

I want to show all of the series on the same chart using the same timeline (same Axis) - do I need to create hundreds of thousands of blank values in each series, to cover all the values in the X Axis?

I was thinking about using for the sparse series a ScatterSeries, but that seems to only support NumericXAxis, and I want dates.

I'm only evaluating so there might be an obvious answer that I'm missing.