Sankey diagram demos

Simple flow

      stateDiagram-v2
      direction LR
      State1: A state with a note
      note right of State1
        Important information!
You can write notes.
And\nthey\ncan\nbe\nmulti-\nline.
      end note
      State1 --> State2
      note left of State2 : Notes can be to the left of a state\n(like this one).
      note right of State2 : Notes can be to the right of a state\n(like this one).