Figure 6. Accuracy and robustness of 2LETFM as a function of the ratio of normal to tangential deformation created by the cell on the substrate, W₀/U₀.

(a) Recovered value σ_r of the Poisson’s ratio, plotted as a function of W₀/U₀. The data are represented as mean ± standard deviation obtained from N = 100 random realizations. Each curve is obtained for a different value σ_e of the exact Poisson’s ratio that is being recovered by 2LETFM. This exact value is indicated with a dashed horizontal line in each case. (b) Contour plot of the relative error of σ_r as a function of W₀/U₀ and σ_e. The relative error is defined as |σ_r − σ_e|/σ_e. (c) Contour plot of the relative uncertainty of σ_r as a function of W₀/U₀ and σ_e. The relative uncertainty is defined as r.m.s. (σ_r)|/σ_e. The data were obtained for S2N = 1 and h₀ − h₁ = 0.15h₀ = 2.5 μ.