A system and method of multi-frame sampling for statistical analysis employs an estimator that may be generalize to two or more overlapping sampling frames. The slurry is continuously discharged from polymer-rich zones of the reactor and enters one or a series of non-cyclonic flash vessels, in which the particles separate from the fluid. The first temperature is greater than the second temperature. The weight transferred to the bogey beam is proportionately distributed between the front steering axle and middle axle. The retaining ring includes a u-shaped cross section defined by an annular recess that extends in a circumferential direction of the retaining ring at a radially interior portion of the retaining ring. The AP transmits a second scheduling message that reserves a second transmission burst for MU-MIMO transmission.