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When we talk about page size, we’re talking about the page size you’ve defined for your publication. This page size should be the same as the page size of the printed piece you intend to produce. “Paper size,” on the other hand, is the size of the medium you’re printing on. The Setup pane of the Print dialog box lets you specify paper size, as well as how you want the page to appear on that paper (see Figure 11-3).