# $T_2>2T_1$ qubits on the ibm_washington quantum processor

I have been checking out the parameters of the new ibm_washington processor and I have the following doubt about the calibration data provided by them. Checking out the relaxation and dephasing times I found out that some of their qubits are said to have $$T_2>2T_1$$. For example, see qubits Q2 or Q21. I understand that the dephasing times they provide are the ones obtained by Ramsey's experiments. However, relaxation and dephasing times are related by the expression $$$$\frac{1}{T_2}=\frac{1}{2T_1}+\frac{1}{T_\phi},$$$$ where $$T_\phi$$ is the pure dephasing time. From this equation, it can be seen that qubits that have $$T_2>2T_1$$ make no physical sense since that would imply that the pure dephasing time is negative. Therefore, I am wondering what's going on with the decoherence time values that are being provided by IBM for the newest processor. I have thought about measurement error, but qubits Q2 and Q21 are not even close to the Ramsey limit $$T_2\approx 2T_1$$. Maybe that due to the novelty of the system the data is not still accurate? Or may I be missing something?