def __init__(self, data: pd.DataFrame):
        """Inits T1DecayResult.

        Args:
            data: A data frame with three columns:
                delay_ns, false_count, true_count.
        """
        assert list(data.columns) == ['delay_ns', 'false_count', 'true_count']
        self._data = data
Inits T1DecayResult.

        Args:
            data: A data frame with three columns:
                delay_ns, false_count, true_count.
        
cirq-core/cirq/experiments/t1_decay_experiment.py