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 0.1001315 0.0 0.200263 4 h after dark 0.1319605 0.0 0.263921 8 h after dark 0.066129 0.0 0.132258 12 h after dark 0.054814 0.0 0.109628