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      <div class="title_topic5" id="xps10_pagetitle">Reference Vector</div>
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      <p class="para_topic">Allows you to specify the reference vector. Opens the Vector Constructor dialog.</p>
      <div class="title_division">Slope</div>
      <p class="para_division">A Slope of surface is the angle between a surface normal and a plane that is normal to the reference vector. The range of surface slope is set between -90 through 90 degrees, and extends from the opposite direction of the reference vector to the reference vector.</p>
      <p class="para_division">Use the Specify Reference Vector option to select a reference vector.</p>
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                  <p class="para_note_body">  The Slope analysis is particularly useful to the mold designer. Think of the reference vector as the direction to pull out the product from a mold. A negative slope indicates that there will be a problem pulling out the product. </p>
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