Figure 4.

Phase II, recorded position of centerline of solid at x = 0 mm under zero inflow conditions, Y ^II, and subject to period inflow, y(t), at t ∈ {t ₁,t ₄,t ₆,t ₈,t ₁₀,t ₂₀} (see Equation 1). Shown are data points extracted from MRI data and fit polynomial of order 4, $y(z)=ŷ[p_1(z/\widehat{z})+p_2{(z/\widehat{z})}^2+p_3{(z/\widehat{z})}^3+p_4{(z/\widehat{z})}^4]$,  $z\in [0,\widehat{z}]$. Coefficients and root‐mean‐square error (rmse) as given in Table