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Distribution of the first and second period in feeding behavior. For each individual, these two periods were defined as the highest and second highest peak in the average 14-d Lomb–Scargle (normalized) power spectrum. Each bar shows relative numbers of mice with their first (filled part of each bar) and the second (open part) most prominent rhythm at a specific period length (10-min resolution); n = 334/332 (first/second; +/+); n = 362/360 (tau/+); n = 85/81 (tau/tau).
