condition mean min max 4 h after light 1.9509 1.20078 2.70102 8 h after light 3.767815 3.39494 4.14069 12 h after light 3.53704 3.10073 3.97335 4 h after dark 5.05547 4.65347 5.45747 8 h after dark 4.126715 4.09229 4.16114 12 h after dark 4.394775 3.16421 5.62534