Where can I find explanation of tx-rate-set?

Each registration entry in caps-man has a value like these (wAP-ac in this case) :

tx-rate-set=CCK:1-11 OFDM:6-54 BW:1x SGI:1x HT:0-15
tx-rate-set=OFDM:6-54 BW:1x-4x SGI:1x-4x HT:0-15 VHTMCS:SS1=0-9

What do they mean?
Where is it explained ?
Thanks

https://wlanprofessionals.com/mcs-table-and-how-to-use-it/

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Thank you