Fig. 3.

Values of $P_D$ (upper, black points) and $P_I$ (lower, teal points) as a function of position within a freestanding thin film at $T=\mathrm{\hspace{0.17em}0.425}$ and $t_{age}\approx \mathrm{\hspace{0.17em}5}\times {10}^5$, derived from the $P_R(S)$ curves in Supporting Information. Dashed lines correspond to the bulk values of these quantities obtained by fitting $P_R(S)$ vs $1/T$ for $S=-2,-1,\mathrm{\dots },1,2$ for bulk samples prepared at different $T$ and zero pressure (shown in Inset, with the blue-to-red (bottom-to-top) scale going from $S=-2$ to $S=\mathrm{\hspace{0.17em}2}$). Although there are small deviations of the softness-dependent terms very close to the edge of the film, these are small compared with the large enhancement of the softness-independent terms. This enhancement persists on a length scale matching the enhancement of dynamics seen in Fig. 1.