title: Draw equipotential lines on scatter plot in Python
body: <p>I have random data on x and y axis. I'd like to draw equipotential lines on which |xy|=constant over the scatter plot of (x,y). I need some help with this. Thank you!</p>
  
  <p>Here is the example of what I want:
  <img src="https://i.stack.imgur.com/yOh3c.png" alt="enter image description here"></p>