(A) Sketch showing approximate locations along the arm of the excised tissues studied. (B and D) Collated results of independent measurements of ν_B (x) using the hand-held probe at different positions of the Brachial/Radial artery (BA/RA) and Median nerve (MN) as indicated in “A” ( = mean of 5 measurements). (C and E) Corresponding plots of Γ_B versus ν_B. (Solid symbols = individual measurements; open symbols = mean; dashed line = trend line of mean). In (C) the Pearson correlation coefficient for the individual measurements is 0.46, whereas for (E) it is −0.53. (F and G) Expected frequency dispersion of the complex modulus M = M′ + iM″ when probing (F) a heterogeneous sample with different relaxation times (τ) in the vicinity of , and (G) the effect of different strengths of a relaxation process with as may occur for different solid fractions. (H) Sketch of the expected scaling of Γ_B with respect to ν_B for the two scenarios. Statistics performed using unpaired t-test with Welch’s correction (*p < 0.05, **p < 0.01).