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The trick here is to create a gantt chart as a secondary axis on a dual axis graph.
I have attached a revised workbook. Let me know if this works for you, or if you have other questions.
Nicholas: That worked great, thanks.
Exactly what I was looking for, I think. Unfortunately, I'm working in Tableau Public and can't open the example workbook. Any hints about what you mean by creating a Gantt chart? I try the Gantt bars as marks, but it just makes my circles into bars.