Figure 3.

Phase I, recorded position of centerline of solid at x = 0 mm under zero inflow conditions, Y ^I, subject to constant inflow, y ^I, and relative displacement, y ^I − Y ^I. Shown are data points extracted from MRI data and polynomial fits 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