user: Question: What is the size of the biggest crowd for a game where Fitzroy was the away team?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Geelong', '19.15 (129)', 'Hawthorn', '12.12 (84)', 'Kardinia Park', 13000.0, '19 April 1947']
SQL:

assistant: SELECT MAX("Crowd") FROM "Table" WHERE "Away team" = 'Fitzroy';