@abc.abstractproperty
    def columns(self):
It's not clear what the interpolating function is, so we'll do
dataset/ETHPy150Open openstack/rally/rally/task/processing/charts.py/Table.columns--crossover with--dataset/ETHPy150Open Axelrod-Python/Axelrod/axelrod/strategies/axelrod_first.py/Feld._cooperation_probability