Heat map (vertical): AAAAAAAAAAAAAAAAAAABDEFGHHIJJJKKLLLMMMNNNNOOOOPPPPQQQQQQRRRRRRSSSSSSSSTTTTTTTTTTTUUUUUUUUUUUUUUUUUUUUVVVVVVVVVVVVVVVVVVUUUUUUUUUUUUUUUUUUUUTTTTTTTTTTTSSSSSSSSRRRRRRQQQQQQPPPPOOOONNNNMMMLLLKKJJJIHHGFEDBAAAAAAAAAAAAAAAAAAA