Head to Head BMW Sauber driver comparison for 2007 season.
[{'label': 'Nick Heidfeld', 'data': [4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5]}, {'label': 'Robert Kubica', 'data': [None, 20, 8, 6, 7, 7, None, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6]}, {'label': 'Sebastian Vettel', 'data': [None, None, None, None, None, None, 16, None, None, None, None, None, None, None, None, None, None]}]