Floating and Reversed Graphs

Graph Challenge 1 looks to me like a basic clustered column chart with horizontal lines added to it. I would probably use one of the techniques described here (https://peltiertech.com/Excel/Charts/AddLine.html ) to add the horizontal lines to the column chart.

Graph Challenge 2 looks to me like a basic column + line combination chart (with the line series formatted to be marker only without the line). Are you familiar with creating combination charts (A simple tutorial if needed: https://www.excel-easy.com/examples/...ion-chart.html )?

What questions do you have about those procedures?

I won't be able to upload a sample for a while (maybe until the weekend). Were there specific steps in creating these charts that you did not understand?