condition mean min max 4 h after light 7.407659 6.830431 7.984887 8 h after light 7.681573 7.361977 8.001169 12 h after light 8.8616815 7.763586 9.959777 4 h after dark 9.262260999999999 9.130621 9.393901 8 h after dark 10.0096585 8.295321 11.723996 12 h after dark 7.151747 7.151747 7.151747