condition mean min max 4 h after light 7.9060405 7.901873 7.910208 8 h after light 7.811199 7.514383 8.108015 12 h after light 8.5909115 8.053576 9.128247 4 h after dark 7.7708525 7.24189 8.299815 8 h after dark 8.0310615 7.954108 8.108015 12 h after dark 8.135315 8.135315 8.135315