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 0.163631 0.0 0.327262 8 h after dark 0.081278 0.0 0.162556 12 h after dark 0.0679695 0.0 0.135939