Exactly as described, this reports the average frame size a given EMIX sequence actually produces when run on a specific generator entity. Because the average depends on both the letters chosen and their relative frequency in the sequence, not just which sizes are included, this precomputed value saves an operator from manually averaging the decoded per-letter sizes when trying to estimate the packets-per-second load a given sequence will place on that particular entity's hardware. For example, an EMIX sequence heavily weighted toward the "a" (64-byte) letter might report an average frame size of only 180 bytes, signaling a packets-per-second-heavy rather than bandwidth-heavy test load on that entity.