condition mean min max 4 h after light 0.7174815 0.552824 0.882139 8 h after light 0.6972455 0.60455 0.789941 12 h after light 1.42836 1.34066 1.51606 4 h after dark 1.881135 1.80697 1.9553 8 h after dark 1.3739785 0.997277 1.75068 12 h after dark 1.206228 0.911296 1.50116