It also has been shown that the error is often larger when using the CP method since the central atoms in the system have much greater freedom to mix with all of the available functions compared to the outer atoms. Whereas in the CHA model, those orbitals have no greater intrinsic freedom and therefore the correction treats all fragments equally.
The error is often larger when using the CP method since the central atoms in the system have more freedom to mix with all available functions compared to outer atoms. Conversely, in the CHA model, those orbitals are restricted and therefore the correction treats all fragments equally.