CREATE TABLE table_13198 ("Tie no" TEXT, "Home team" TEXT, "Score" TEXT, "Away team" TEXT, "Date" TEXT)

What is the Away team with Newcastle United as the Home team?
SELECT "Away team" FROM table_13198 WHERE "Home team" = 'newcastle united'
SELECT "Away team" FROM "table_13198" WHERE "Home team" = 'newcastle united'