what's the difference for speculative-eagle-topk speculative-num-draft-tokens

[WeiboXu]

what's the difference for speculative-eagle-topk speculative-num-draft-tokens ,from the example, by default it will use --speculative-eagle-topk 8 --speculative-num-draft-tokens 64, and from the help ,it means:
--speculative-num-draft-tokens SPECULATIVE_NUM_DRAFT_TOKENS
The number of token sampled from draft model in Speculative Decoding.
--speculative-eagle-topk {1,2,4,8}
The number of token sampled from draft model in eagle2 each step.

My question is:
which one is the value for tokens numbers which generated by draft model first? speculative-num-draft-tokens or speculative-eagle-topk? And what does mean for another one.

Thanks.