  This paper presents accurate data for the physical aging of organic glasses
just below the glass transition probed by monitoring the following quantities
after temperature up and down jumps: the shear-mechanical resonance frequency
(around 360 kHz), the dielectric loss at 1 Hz, the real part of the dielectric
constant at 10 kHz, and the loss-peak frequency of the dielectric beta process
(around 10 kHz). The setup used allows for keeping temperature constant within
100 micro Kelvin and for thermal equilibration within a few seconds after a
temperature jump. The data conform to a new simplified version of the classical
Tool-Narayanaswamy aging formalism, which makes it possible to calculate one
relaxation curve directly from another without any fitting to analytical
functions.
