<bottom> (Bottom Border)
This element defines the line properties associated with the bottom border in a table cell.
example: 
<bottom> <ln w="12700" cmpd="sng"> <solidFill> <schemeClr val="accent1"/> </solidFill> </ln> </bottom>
In this example, we see the bottom border on a table cell to be a single 1pt line which is colored accent 1. ]
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The following XML Schema fragment defines the contents of this element:
<complexType name="CT_ThemeableLineStyle">
	<choice>
	<element name="ln" type="CT_LineProperties" minOccurs="1" maxOccurs="1"/>
	<element name="lnRef" type="CT_StyleMatrixReference" minOccurs="1" maxOccurs="1"/>
	</choice>
</complexType>