Fig. 1.

From left to right, the curves show $\text{log}({\tau }_{\alpha }^{-1}(z)/{\tau }_{\alpha }^{-1}(0))$ (purple dot-dashed curve), $\text{log}(p_h(z)/p_h(0))$ (red dashed curve), $⟨S(z)-S(0)⟩$ (solid blue curve), $\text{log}(\text{DW}(z)/\text{DW}(0))$ where DW is the local Debye–Waller (DW) factor (green dashed curve), and density profile $\rho (0)-\rho (z)$ (black dotted curve). All data are for a freestanding thin film at $T=\mathrm{\hspace{0.17em}0.425}$ and $t_{age}\approx \mathrm{\hspace{0.17em}5}\times {10}^5$ (${\tau }_{\alpha ,z=0}\approx \mathrm{\hspace{0.17em}2.2}\times {10}^4$). (Inset) Spatial profile of mean softness (blue solid curve), log of normalized $⟨p_h⟩$ (red dashed curve), and density profile $\rho (0)-\rho (z)$ (black dashed curve) for a supported film at $T=\mathrm{\hspace{0.17em}0.45}$ and $t_{age}\approx \mathrm{\hspace{0.17em}6}\times {10}^5$ (${⟨p_h⟩}_{z=0}\approx \mathrm{\hspace{0.17em}0.27}$).