We start by introducing the quantities and corresponding notations used thereafter. Following our previous articles , the real and imaginary parts of the DRT impedance model vector given by 𝒁 DRT = 𝒁 DRT,re + 𝑖𝒁 DRT,im are approximated as follows: are the experimental frequencies. 𝑨 𝛾,re and 𝑨 𝛾,im are discretization matrices given elsewhere .