Note that maximum size is defined as >=1514, with 50% of packets being >= 1024. It very well may be that ~45% of packets are >= 1400 bytes. The transfer graph

Note that maximum size is defined as >=1514, with 50% of packets being >= 1024. It very well may be that ~45% of packets are >= 1400 bytes. The transfer graph is wrong - it shows packet count distribution, not size. Quick math says roughly 90% of transfer size are >= 1024 byte packets.