where 𝔼[. ] denotes expected value computed from the samples obtained as described in the previous section, 𝜸 exact,𝑘 , is the exact DRT vector corresponding to exact impedance vector 𝒁 exact,𝑘 , 𝜸 𝑘 and 𝒁 exact,𝑘 are the correspondingly recovered DRT and impedance vectors, respectively. As above, 𝜸 is discretized with respect to log 𝝉 .