condition	mean	min	max
4 h after light	19164.863635	18604.26444	19725.46283
8 h after light	19589.38194	19013.65716	20165.10672
12 h after light	19952.827830000002	19725.46283	20180.19283
4 h after dark	20058.30704	20007.2439	20109.37018
8 h after dark	18432.85292	17450.11832	19415.58752
12 h after dark	19042.8213	19042.8213	19042.8213