有没有办法在高图中显示同一系列的重叠点？

I've made a graph with Highchart which makes it possible for 2 datapoints of the same serie to overlap, however only the top datapoint shows. I want them both to show so that I can read the information of both the points. I have found an example how this works with 2 series but I really don't get how I can make that work if you only have 1 serie of datapoints that can overlap.I've made a graph with Highchart which makes it