, is used, although calculations using complex impedances as written in Equation have also been suggested . The latter results in a sensitivity enhancement of about √ 2. Alternatively, an independent DRT calculation with the real and the imaginary part of Z can be used as consistency check, since the same real-valued g should be obtained in both cases. Such a check is analogous to a Kramers-Kronig test that is commonly conducted in standard ECM analysis to confirm causality, linearity, and stability of EIS data .