CREATE TABLE table_204_621 (id DECIMAL, "no." DECIMAL, "date" TEXT, "tournament" TEXT, "winning score" TEXT, "margin\ of victory" TEXT, "runner ( s ) -up" TEXT)

what is the total margin of victory in 1963 tucson open invitational ?
SELECT "margin\nof victory" FROM table_204_621 WHERE "date" = 1963 AND "tournament" = 'tucson open invitational'
SELECT "margin\nof victory" FROM "table_204_621" WHERE "date" = 1963 AND "tournament" = 'tucson open invitational'