CREATE TABLE table_73539 ("Horizontal order" FLOAT, "Height order" FLOAT, "Soundfield type" TEXT, "Number of channels" FLOAT, "Channels" TEXT)

If the channels is wxyzrstuvpq, what is the horizontal order?
SELECT "Horizontal order" FROM table_73539 WHERE "Channels" = 'WXYZRSTUVPQ'
SELECT "Horizontal order" FROM "table_73539" WHERE "Channels" = 'WXYZRSTUVPQ'