condition	mean	min	max
4 h after light	18609.626584999998	18458.4553	18760.79787
8 h after light	19476.526415	19097.68437	19855.36846
12 h after light	17969.876955	15681.23206	20258.52185
4 h after dark	16347.27272	16245.29891	16449.24653
8 h after dark	16134.929585000002	16091.43826	16178.42091
12 h after dark	17892.15513	17892.15513	17892.15513