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Well this is the season so far:
Broncos - 1 & 3 peaks were derbies. 2nd was following on from a derby week. 4th was Vegas event. The other non derbies were all lower.
Cowboys - 1 & 2 peaks were derbies. 3rd was following on from a derby week. 4th was a derby too. The other non derbies were all lower.
Dolphins - 1 & 2 peaks were derbies. 3rd & 4th were following on from a derby week. 5th & 6th were derbies.
Titans - 1 was a derby. 2 was opening game. 3 was the last round. 4th was a derby. The other non derbies were lower.
I think what you see is interest peaks when there is a derby game (Rounds 4 & 6 in particular) and then there is often a residual overhang in interest in that same team the following week, particularly if a team has played well (Round 7).