Two-time correlation functions measured with XPCS in Zr67Ni33 at T = 373 K. Data acquisition started at t 0 = 1400 s (top panel) and t 0 = 49 000 s (bottom panel) from temperature equilibration. The age of the sample at any point in the figure can be taken as t age = t 0 + (t 1 + t 2)/2 s. The huge slow down of the dynamics at the different sample ages is well illustrated by the clear broadening of the intensity around the diagonal from the left bottom corner to the top right corner in the bottom panel with respect to the case corresponding to a much shorter t w (top panel).
Selection of the intensity correlation functions measured with XPCS at T = 373 K for different waiting times from temperature equilibration. On increasing the waiting time, the decay clearly shifts toward longer time scales due to physical aging. The data are reported together with the resulting fit obtained using Eq. (4) .
(a) Waiting time dependence of the structural relaxation time measured at T = 373 K for different wave-vectors around the first sharp diffraction peak (q p = 2.55 Å−1). The inset (b) reports a zoom of the data taken at large waiting times. (c) Corresponding shape parameter. (d) Selection of the correlation curves corresponding to the data reported in (a) as a function of the time rescaled by the structural relaxation time obtained from the analysis of the curves with the KWW model function of Eq. (4) . The inset (e) indicates the position of the different investigated qs.
Structural relaxation times measured in two as quenched glasses of Mg65Cu25Y10 at T/T g = 0.995 with different thermal histories and in Zr67Ni33 at T/T g = 0.577. All the data are normalized for the τ0 parameter obtained from the analysis of the fast aging with the empirical model function (5) and are reported as a function of the time rescaled by the τ* parameter. The data for Mg65Cu25Y10 are taken from Ref. 23 .
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