Head to Head Cooper-Maserati driver comparison for 1961 season.
[{'label': 'Maurice Trintignant', 'data': [7, 12, 15, None, 16, 18]}, {'label': 'Lorenzo Bandini', 'data': [None, 22, None, 25, 27, 20]}, {'label': 'Massimo Natili', 'data': [None, None, None, 39, None, 47]}, {'label': 'Renato Pirocchi', 'data': [None, None, None, None, None, 29]}]