CREATE TABLE table_16539 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "U.S. viewers  ( millions ) " TEXT)

How many millions of viewers watched the episode directed by Anthony Hemingway?
SELECT "U.S. viewers (millions)" FROM table_16539 WHERE "Directed by" = 'Anthony Hemingway'
SELECT "U.S. viewers (millions)" FROM "table_16539" WHERE "Directed by" = 'Anthony Hemingway'