In the second step, the sample is quenched again from T 0 to a temperature T 1 that is lower than T r , so that T 0 > T r > T 1 . But now, the system is held at temperature T 1 only until the time t 1 when its volume reaches the equilibrium value of T r , meaning V ( t 1 ) | T 1 = V e q ( T r ) .