Fig. 9From: Maintenance schedule optimization based on distribution characteristics of the extreme temperature and relative humidity of Cave 87 in the Mogao GrottoesAnnual distributions of the daily extreme times of the relative humidity difference and their statistics. The maximum value: black, the minimum value: red. B–1 is annual distributions of location No.1. B–2 is statistics of location No.1. C–1 is annual distributions of location No.4. C–2 is statistics of location No.4Back to article page