Use the map to identify a site of interest. Active sites are shown as , inactive sites are shown as , and co-located sites are shown as . Holding the mouse over a marker will reveal the site name and ID number. A single click on the marker will pop up additional information about the site as well as links to data and graphs. While the popup is visible, hit the TAB key and then ENTER or RETURN to view results. Alternatively, you can skip this map interface and use the table below the map.