Heat map (vertical): ZZZZZZZZZZZXWVVUUUTTTSSSRRRRQQQQQQPPPPPPOOOOOOONNNNNNNNNMMMMMMMMMMMMLLLLLLLLLLLLLLLLLLLKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKKLLLLLLLLLLLLLLLLLLLMMMMMMMMMMMMNNNNNNNNNOOOOOOOPPPPPPQQQQQQRRRRSSSTTTUUUVVWXZZZZZZZZZZZZZ