title: Is there a way to indicate on a plot what different colors for each point and markers represent?
body: <p>Is there a way I could add a box (like how I drew in the image below) to indicate what different colors for points and the different markers represent?</p>
  <p>Or if there is any other way than adding the boxes, since I want to make it clear for the viewer what the plot exactly means.</p>
  <p><a href="https://i.stack.imgur.com/H7t30.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/H7t30.png" alt="Scatter plot with different markers and colors" /></a></p>