The 20 top witness plus one randomly chosen backup witness will make up the price feed sample for the current round. The median is taken across those 21 witnesses.
I am 95% sure that the price at the time of payout is the median of those medians across the past 3.5 days.
This comment has received a 20.92 % upvote from @steemdiffuser thanks to: @stimialiti. Steem on my friend!
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