[Python] How to connect subplots with a dotted line boundary instead of a solid line with...

How to connect subplots with a dotted line instead of a solid line in python? I used this site https://matplotlib.org/devdocs/gallery/subplots_axes_and_figures/subplots_demo.html to combine 3 scatter plots horizontally but they have a solid line between them. Is there a way to join them with a dotted line so it looks like a timeline,something like shown in this image

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