condition mean min max 4 h after light 1.064385 1.0291 1.09967 8 h after light 1.0018495 0.929979 1.07372 12 h after light 1.24407 1.03902 1.44912 4 h after dark 1.32661 1.21546 1.43776 8 h after dark 1.25514 1.21799 1.29229 12 h after dark 1.40609 1.39351 1.41867