Head to Head Sauber driver comparison for 2002 season.
[{'label': 'Nick Heidfeld', 'data': [7, 9, 9, 7, 7, 7, 9, 9, 8, 8, 8, 8, 8, 10, 10, 10]}, {'label': 'Felipe Massa', 'data': [10, 11, 12, 10, 10, 12, 12, 11, 11, 11, 11, 11, 12, 12, None, 13]}, {'label': 'Heinz-Harald Frentzen', 'data': [None, None, None, None, None, None, None, None, None, None, None, None, None, None, 17, None]}]