This records the frame size in bytes the frame-loss results in this row were measured at, unless it reads 0, in which case the companion EmixSequenceId identifies the EMIX frame-size-mix profile used instead. An admin uses this the same way as in the throughput table, to line up a loss percentage with the correct point on the RFC2544 frame-size sweep, since loss behavior often varies sharply by frame size (smaller frames stress packet-per-second forwarding capacity, not raw bandwidth). For example, a loss result appearing only at cienaCesBenchmarkGenTestSessionFramelossResultsFrameSize = 64 while larger sizes pass cleanly would point to a packets-per-second bottleneck rather than a bandwidth limitation.