Once you have displayed a chart with UA, you can use a grid to add vertical lines to your chart. Many people feel these improve the visibility to the passage time and relationship to studies. Right-click your mouse and click "X Grid" to bring up the following options:
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None - Normal chart with no grid lines
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Points - Dotted Vertical lines
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Lines - Solid Vertical lines
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Regions - Shaded Vertical regions
This feature may be combined with the Y Grid option, also on the right-click menu.