The effect of the DDF on the dynamics is presented in Figure , where the simulations show typical series of sustained maser bursts for different values of the spin density m o . Interestingly, the envelope of the transverse signal shown in Figure qualitatively reproduces the main features of the experiments, in which an apparent "steady-state" of regularly spaced masers was observed. Alternatively, in the simulations performed with decreasing values of m o (from top to bottom), the intensities of the bursts monotonously decay and the transverse magnetization eventually reaches a constant intensity, indicating a steady-state precession about the z axis. Besides, the details of each maser pulse envelope are also affected. Indeed, one observes that for large values of m o , each pulse exhibits an asymmetric profile with several pulses within it, whereas in the absence of any distant dipolar field, this "bursts within burst" pattern disappears, and the maser shape recovers the conventional symmetric, hyperbolic secant profile, as expected from the simpler BMP model used in previous work. The effect of the decoherence rate γ 2 on the maser pulse dynamics was also investigated, and results are illustrated in Figure . Two such simulations, performed at constant γ rd and m 0 , therefore identical RD and DDF effects, and for different values γ 2 leading to γ rd /γ 2 = 3.1 and γ rd /γ 2 = 2, are shown. In both cases a continuous series of sustained maser are obtained. For larger γ rd /γ 2 ratios, maser pulses are sharper and have shorter duration, which attests for a more efficient RD for longer transverse relaxation, a known and expected feature. This is associated with larger excursions of m z during the pulses and larger the maximum excursion from its initial value (see Figure ). Nevertheless, it is noteworthy that in all the simulations, the m z component remains close to its initial value, within ∼ 79 -86% of its minimum, indicating that the trajectory of the magnetization vector lies in the proximity of the south pole of the Bloch sphere. Thus, with these parameters, the maser effect is actually rather inefficient, due to too fast decoherence. Again, as shown in the previous example, the envelope of the maser pulse exhibits a clear asymmetry, with the presence of multiple, smaller, maser pulses within the main pulse. But for the lower γ rd /γ 2 ratio, this asymmetry vanishes, suggesting that the presence of the faster decoherence prevents the distant dipolar field to significantly impact on the magnetization dynamics.