I'm assuming it's not an image you can right-click and save?
If you're on a PC, make sure you can see the entire graph you want. press the Prt Scr button on your keyboard. Now load up Paint/Photoshop/Whatever you want and hit Ctrl-V (or Edit Menu/Paste). YOu'll see the whole screen pop up. Now use the crop tool to select the area of your image, go to Edit and Save Selection As in Paint and there you go.
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