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<?xml version="1.0"?>
<DDDefinition xmlns="http://www.cern.ch/cms/DDL" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.cern.ch/cms/DDL ../../Schema/DDLSchema.xsd">
<MaterialSection label="materials.xml">
<!-- this can show you an error of N < Z from SimG4Core...
<ElementaryMaterial name="Nitrogen" atomicNumber="7" atomicWeight="14.007" density="0.808" symbol="N"/>
-->
<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>
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