how to build line segments?

[thomasd3]

If I want to draw (1, 2) -> (4, 5), and then (10, 10) -> (20, 20)

I can't seem to do things such as:

Chart.Line [1, 2; 4, 5; null; 10, 10; 20, 20]
Chart.Line [Some(1, 2; Some(4, 5); None; Some(10, 10); Some(20, 20)]
Chart.Line [Some 1, Some 2; Some 4, Some 5; None; Some 10, Some 10; Some 20, Some 20]

How can this be done?

[thomasd3]

I found that I had to pass a nan