<uFill> (Underline Fill)
This element specifies the fill color of an underline for a run of text.
example: 
<p:txBody>
  …
  <a:p>
    <a:r>
      <a:rPr …>
        <a:uFill>
          <a:solidFill>
            <a:srgbClr val="FFFF00"/>
          </a:solidFill>
        </a:uFill>
      </a:rPr>
      …
      <a:t>Sample Text</a:t>
      …
    </a:r>
  </a:p>
  …
</p:txBody>
The underline color of the above text will be yellow specified by the <srgbClr> child element. ]
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The following XML Schema fragment defines the contents of this element:
<complexType name="CT_TextUnderlineFillGroupWrapper">
	<group ref="EG_FillProperties" minOccurs="1" maxOccurs="1"/>
</complexType>