Precise time-matching in chimpanzee allogrooming does not occur after a short delay

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Fig 6

Box plots for the reciprocity measure ρ = |X − Y|/(X + Y) by comparison condition.

Delayed grooming Δ ≥ 0 is shown on the left (n = 555), and within-bout grooming Δ < 0 on the right (n = 277).