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Table 1 Percentages of errors (and standard errors) under each condition among chimpanzees in Experiment 2.

From: Pacman in the sky with shadows: the effect of cast shadows on the perceptual completion of occluded figures by chimpanzees and humans

   Control Gap Occluded
Square-Shadow No Shadow 0(0.0) 1.3(1.5) 7.2(4.5)
  Shadow 1.3(0.9) 10(5.6) 10(5.2)
Pacman-Shadow No Shadow 0(0.0) 1.3(1.5) 3.4(2.5)
  Shadow 4.4(2.3) 7.5(1.3) 8.8(2.9)