condition mean min max 4 h after light 0.0 0.0 0.0 8 h after light 0.0 0.0 0.0 12 h after light 0.0 0.0 0.0 4 h after dark 0.0 0.0 0.0 8 h after dark 6.533333333333333e-09 0.0 1.96e-08 12 h after dark 0.0 0.0 0.0