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The concept of "longitudinal overlaps" means that a stream earlier in the day will affect a stream later in the day. Like of there's a big stream at 6:00am that will depress the numbers of a stream at 6:00pm.
Here's a good example, Enna had a collab with Kyo and Enna late into the night, and the following morning she gets very low numbers. Because a large portion of her fans stayed up late to watch her.
