user: Question: Which Episode had 9.1 million viewers?
Columns: ['Episode', 'Broadcast date', 'Run time', 'Viewers (in millions)', 'Archive']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['" Episode One "', '24February1973', '23:27', '9.1', 'PAL 2" colour videotape']
SQL:

assistant: SELECT "Episode" FROM "Table" WHERE "Viewers (in millions)" = '9.1';