In your drawing, I think it should be where the blue and green scatters are completely overlapping, that would be more like the actual data. They would be compl

In your drawing, I think it should be where the blue and green scatters are completely overlapping, that would be more like the actual data. They would be completely separate scatter plots if it was comparing something like humans to algae or such. Even humans and elephants have a lot of overlap in their DNA, you'd have to get pretty different to have no overlap.