The graph is an event-study figure titled "College Vaccination Mandates and COVID-19 Cases." The chart plots estimates of the difference in the COVID-19 case rate between counties with and without a college vaccine mandate, relative to two weeks before the semester begins. The y-axis ranges from -100 to 40 cases per 100,000 county residents, and the x-axis ranges from eleven weeks before to eleven weeks after the start of the semester. Four weeks after the semester begins, the case rate difference declines to -56, and is -20 eleven weeks after the semester begins. Source: Researchers' calculations using data from the CDC, C2i, and IPEDS