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                <h1>
                    About rulers
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                <div><p>Rulers help you position images or
elements precisely. When visible, rulers appear along the top and
left side of the active window. Markers in the ruler display the
pointer’s position when you move it. Changing the ruler origin (the
(0, 0) mark on the top and left rulers) lets you measure from a
specific point on the image. The ruler origin also determines the
grid’s point of origin.</p>
<p>To show or hide rulers, choose View&#160;&gt; Rulers.</p>
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