  Effect of initial conditions on aging properties of the spin-glass state is
studied for a single crystal Cu:Mn 1.5 at %. It is shown that memory of the
initial state, created by the cooling process, remains strong on all
experimental time scales. Scaling properties of two relaxation functions, the
TRM and the IRM (with $t_{w1}=0$ and $t_{w2}=t_{w}$), are compared in detail.
The TRM decay exhibits the well-known subaging behavior, with $\mu<1$ and
$t_{w}^{eff}>t_{w}$. The IRM relaxation demonstrates the superaging behavior,
with $\mu>1$ and $t_{w}^{eff}<t_{w}$. It is shown that an average over
different initial conditions leads to systematic improvement in $t/t_{w}$
scaling. An effective barrier, describing influence of the initial state on
spin-glass relaxation, is found to be almost independent of temperature. These
results suggest that departures from full $t/t_{w}$ scaling, observed in aging
experiments, are largely due to cooling effects.
