user: Question: What is the lowest attendance that has a week less than 4, and W 13-7 as the result?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'October 10, 1943', 'Brooklyn Dodgers', 'W 27-0', 35450.0]
SQL:

assistant: SELECT MIN("Attendance") FROM "Table" WHERE "Week" < 4.0 AND "Result" = 'W 13-7';