CREATE TABLE table_72651 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "Production code" FLOAT, "Viewers  ( millions ) " TEXT)

How many viewers in millions for episode 'sokka's master'?
SELECT "Viewers (millions)" FROM table_72651 WHERE "Title" = 'Sokka''s Master'
SELECT "Viewers (millions)" FROM "table_72651" WHERE "Title" = 'Sokka\'s Master'