user: Question: Who is the opponent for the game that occurred after week 13?
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']
Types: ['real', 'text', 'text', 'text', 'real']
Sample row: [1.0, 'September 18, 1972', 'at Minnesota Vikings', 'W 24-21', 47900.0]
SQL:

assistant: SELECT "Opponent" FROM "Table" WHERE "Week" > 13.0;