'matplot lib adding a scatter plot to a stairs plot

I have managed to produce a .stairs plot to represent rain events: Accepted answer here, I now want to add a scatter plot which will put a marker in the middle of each column for the interception value for that event. I have the interception values and a time series to plot them against, but whenever I try it, it fails to plot.

This is a very basic version of what I want to produce, with each shape being it's own series: enter image description here



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