Fig. 2From: The role of the California tier system in controlling population mobility during the COVID-19 pandemicChange in the mobility (population not staying at home per 100 persons) in California counties associated with moving to a more restrictive tier (a) or less restrictive tier (b). A positive change indicates the population not staying at home per 100 persons (orange), while a negative change indicates the population staying at home per 100 persons (purple)Back to article page