scatter in the pulse phases it is difficult to define the exact moment when the phases begin to drift. Both the 2002 and 2005 pulse phase drifts end in coincidence with the end of the fast decay. Both the 2002 and 2005 pulse phases drift by $\sim0.2$ cycles.

The slope of the fast decay is consistent with being the same in both outbursts (see also Fig. \[all-lc\]). The pulse phases in both outbursts during this time drift at the same speed of $\sim 0.07\rm\,cycle/day$. The pulse phase behavior in the 2002 and 2005 fast decay is therefore consistent with being identical.

In the 2000 outburst a similar test cannot be performed since [[*RXTE*]{}]{} missed the decaying portion of the outburst, and the observations covered just the re-flaring state. In the 1998 and 2008 outbursts no clear phase drift is observed. We refer to @har08 [@har09] for a detailed discussion of the coherent timing analysis of those two outbursts.

QPO parameters and flux {#phenomenology}
-----------------------

\[qporelations\]

We will not in this paper provide a complete description of all the aperiodic variability observed in the 5 outbursts. For a description of the aperiodic timing features observed in AMXPs, we refer to @str05 