Heat map (vertical): FFFGGHHHHHHIIIJJKKKLLLLLMMMMMMNNNNOOOPPPPPPPPPOONNMMMMMMMNNOOPPPPPPPPPPPPPPPOOOOONNNNNNNNNNNOOOOOOPQQQPPPOOPPPPPPOOOOOOOOOOOPPPPPPPPPPPPPPPPPPPPPPPPQQQQQQQQQQQQQQQQQQQQQPPPOOONNMMLLKKJJIIHHHHGGFFFEEEDDDCCCCCCCBBBBBBBAAAAAAAAA