On the first page, the top graph shows how the median income of Rhode Island high school graduates change each year after high school graduation. This top graph combines the data from multiple graduation cohorts. The bottom graph breaks out the information from the top graph by each graduation cohort. Note that the horizontal axis refers to the number of years after graduation, not the calendar year. For example, "one year after graduation" for the 2015 graduating class is the year 2016, but for the 2005 graduating class it is the year 2006. 

You can filter all these graphs by district and school. Hovering over the graphs shows more information.

The second page allows you to compare two different graphs.