What does the output from /interface w60g print stats mean?

/interface w60g> print stats
name: wlan60-1
beamforming-event: 54
tx-io-msdu: 0
tx-sw-msdu: 21 991 971 947 776
tx-fw-msdu: 83 886 080
tx-ppdu: 27 471 533 513 158
tx-ppdu-from-q: 22 497 060 038 144
tx-mpdu-new: 21 990 115 817 984
tx-mpdu-total: 22 024 871 393 792
tx-mpdu-retry: 587 378 589 696
rx-ppdu: 25 296 963 722 813
rx-mpdu-crc-err: 217 939 050 496
rx-mpdu-crc-ok: 25 309 191 851 339
[admin@MikroTik] /interface w60g>


What are each of the lines? What do the numbers mean?

Thanks,

Joe