I agree with you it would be more sane to have a scale, but as others commented I included it more to have a rough picture of the results than something you can

I agree with you it would be more sane to have a scale, but as others commented I included it more to have a rough picture of the results than something you can get a lot of specific conclusions from. To be honest for some reason the scale showed up incorrectly right in the middle of the matrix, so I just decided to omit it and leave it intuitively clear that dark blue=a lot.