Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What was the archive for episode with 6.6 million viewers?

### Inputs:
table_name: table, columns: ['Episode', 'Broadcast date', 'Run time', 'Viewers (in millions)', 'Archive']

### Response:
SELECT Archive FROM table WHERE Viewers (in millions) = 6.6