condition	mean	min	max
4 h after light	15999.5	15999.5	15999.5
8 h after light	16454.1	15805.4	17102.8
12 h after light	17590.3	16383.0	18797.6
4 h after dark	18415.0	17647.3	19182.7
8 h after dark	18741.9	18183.3	19300.5
12 h after dark	18152.300000000003	17798.9	18505.7