The X-axis array goes to the top terminal on the Bundle node for the XY Graph. The Context Help window shows this when you move the cursor over the graph terminal on the BD.
You do not need the sequence structure. Use dataflow!
I moved the properties which never change outside the case structure. Functionally this makes no difference but it is a form of self-documentation. If it is outside it does not change. If it is inside it changes.
Lynn