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<?xml version="1.0"?>
<DDDefinition>
  <MaterialSection label="testMaterials.xml">
    <ElementaryMaterial name="Nitrogen" density="808*mg/cm3" symbol=" " atomicWeight="14.007*g/mole" atomicNumber="7"/>
    <ElementaryMaterial name="Oxygen" density="8.92535e+15" symbol="O" atomicWeight="9.98579e+22" atomicNumber="8"/>
    <ElementaryMaterial name="Argon" density="1.02298e+16" symbol="A" atomicWeight="2.49336e+23" atomicNumber="18"/>
    <ElementaryMaterial name="Hydrogen" density="4.41899e+17" symbol="H" atomicWeight="6.29106e+21" atomicNumber="1"/>
    
    <CompositeMaterial name="Air" density="7.52102e+15" method="mixture by weight">
      <MaterialFraction fraction="0.7494">
	<rMaterial name="Nitrogen"/>
      </MaterialFraction>
      <MaterialFraction fraction="0.2369">
	<rMaterial name="Oxygen" />
      </MaterialFraction>
      <MaterialFraction fraction="0.0129">
	<rMaterial name="Argon" />
      </MaterialFraction>
      <MaterialFraction fraction="0.0008">
	<rMaterial name="Hydrogen" />
      </MaterialFraction>
    </CompositeMaterial>
  </MaterialSection>
  
</DDDefinition>