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@Greenbank
^ Also see the little upward blip around 24 minutes, this is caused by the main hills on a single lap.
Imagine starting a lap at the bottom of one of the main hills. A full lap in 23 minutes back to that point averages x Watts (the exact figure is irrelevant), but the next couple of minutes will be spent climbing that first hill again almost certainly at a power greater than x W, so the average for 23+2 minutes will be greater than x W, hence the average power graph going up.
#csb