CREATE TABLE table_27980 ("No. in series" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" TEXT, "U.S. viewers  ( million ) " TEXT)

How many million U.S. viewers watched the episode with a production code of 1arc03?
SELECT "U.S. viewers (million)" FROM table_27980 WHERE "Production code" = '1ARC03'
SELECT "U.S. viewers (million)" FROM "table_27980" WHERE "Production code" = '1ARC03'