. There is a discrepancy between waveform-and dc decay-derived rates and their distributions for 3-Dy•C6H6 (Figure ) in the 32-56 K region. This arises due to the very broad distribution of rates: during removal of the initial magnetic field in a dc decay experiment, the faster-relaxing components of the distribution equilibrate, thus biasing the observed decay towards longer relaxation times (ESI Section 7.4). The waveform data are not subject to this issue as switching the field between ± 8 Oe is comparatively fast and the Fourier transform captures the fast-relaxing components; hence, these data are more reliable (note the excellent agreement between ac-and waveform-derived rates and distributions for 3-Dy•C6H6 at ca. 60 K). Indeed, the decay and waveform data agree very well for 4-Dy, where the distribution of relaxation rates is much narrower and the decay measurements are not deterimentally affected by the delay of the field sweeping to zero.