Flux asymmetry (M) vs. quasiperiodicity (Q) plotted for our sample of 470 variable member sources. Primary variability classes are shown by the marker indicated in the legend. Sources with a secondary classification (multiperiodic or long timescale) are marked in addition to their primary class. The dotted lines show the limits in Q and M for the differing classes, with Q = 0.45 and Q = 0.82 dividing the periodic from quasiperiodic and quasiperiodic from stochastic sources, and M = −0.25 and M = +0.25 dividing the burster from symmetric and symmetric from dipper sources.