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XPEEM is particularly well suited for studies of tribochemical processes because elemental and chemical information can be obtained with high spatial resolution about the status of the surfaces of a disk and its slider before and after wear . Clicking on a little slider icon brings up a window with a volume and pan slider for that track . The image flickers like mad when I use a threshold or contrast slider . If the interaction on the site is merely answering questions in a quiz or operating sliders , this activity is not creative .