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    <mover accent="true" id="p1.1.m1.1.1" xref="p1.1.m1.1.1.cmml">
      <mi id="p1.1.m1.1.1.2" xref="p1.1.m1.1.1.2.cmml">E</mi>
      <mo stretchy="false" id="p1.1.m1.1.1.1" xref="p1.1.m1.1.1.1.cmml">¯</mo>
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    <annotation-xml encoding="MathML-Content" id="p1.1.m1.1b">
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        <ci id="p1.1.m1.1.1.1.cmml" xref="p1.1.m1.1.1.1">¯</ci>
        <ci id="p1.1.m1.1.1.2.cmml" xref="p1.1.m1.1.1.2">𝐸</ci>
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<math class="mwe-math-element" xmlns="http://www.w3.org/1998/Math/MathML"><mrow data-mjx-texclass="ORD"><mstyle displaystyle="true" scriptlevel="0"><mrow data-mjx-texclass="ORD"><mrow data-mjx-texclass="ORD"><mover><mi>E</mi><mo>¯</mo></mover></mrow></mrow></mstyle></mrow></math>