condition	mean	min	max
4 h after light	15306.295556666666	12905.37667	17978.53
8 h after light	17102.24222	16539.01	17775.07333
12 h after light	16485.706663333334	13756.52333	18411.70333
1.5 h after dark	17245.46444333333	13290.76333	21189.66667
5.5 h after dark	18015.437776666666	14385.63333	20401.34333
9.5 h after dark	16910.838886666665	15082.01	18413.28333