Question: How do I simplify a hysteresis plot into some sort of a defined line

I have a hysteresis plot wherein the y axis is the piezometric data while the x axis is the reservoir level. The plot is some sort of a loop but not well defined. I need to reduce the hysteresis plot to make it appear like a clustered points in a single line. What I meant is that, so that the hysteresis plot will redound to a single line plot.

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