In order to interact with the plot above, hover your mouse over the plot and select the crosshair icon. With this tool, you can pan (by clicking and dragging) and zoom by scrolling with your mouse. If you get lost in the Galaxy, you can press the home icon to unzoom.
If you stop your cursor on a source, a window will show you the corresponding gamma-ray properties derived from the 3FGL catalog (see the FSSC webpage of 3FGL paper for a more detailed description of the parameters).
Enjoy !