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TODAY'S CHARTS: Why Apple doesn't want a big revenue beat

While Apple is set to release earnings after the bell, all eyes will be on its forward guidance. Shares have climbed 16% in the last 6 months, largely on anticipation of the iPhone 8— Apple's 10th anniversary phone— which is expected to launch this fall with wide-ranging new features. Justine Underhill explains what to watch in the earnings report.