What was the archive for episode with 6.6 million viewers?
CREATE TABLE table_20491 (
    "Episode" text,
    "Broadcast date" text,
    "Run time" text,
    "Viewers (in millions)" text,
    "Archive" text
)
SELECT "Archive" FROM table_20491 WHERE "Viewers (in millions)" = '6.6'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: What was the archive for episode with 6.6 million viewers? ### Input: CREATE TABLE table_20491 (
    "Episode" text,
    "Broadcast date" text,
    "Run time" text,
    "Viewers (in millions)" text,
    "Archive" text
) ### Response: SELECT "Archive" FROM table_20491 WHERE "Viewers (in millions)" = '6.6'