def qubits(self) -> list[cirq.Qid]:
        """Qubits for which we have data"""
        if not self._qubits:
            self._qubits = sorted(self.t1_ns)
        return self._qubits
Qubits for which we have data
cirq-core/cirq/devices/superconducting_qubits_noise_properties.py