CREATE TABLE table_16461 ("No. in season" FLOAT, "No. in series" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "U.S. viewers  ( million ) " TEXT)

Who directed episodes that had 2.61 million U.S. viewers?
SELECT "Directed by" FROM table_16461 WHERE "U.S. viewers (million)" = '2.61'
SELECT "Directed by" FROM "table_16461" WHERE "U.S. viewers (million)" = '2.61'