<?xml version='1.0' encoding='utf-8'?>
<geometry>
    <cell fill="5" id="1" name="Cell 1" region="1 -2 3 -4" universe="0" />
<cell id="101" material="1" name="cell 2" region="-5" universe="1" />
<cell id="102" material="2" name="cell 3" region="5" universe="1" />
<cell id="500" material="2" name="cell 4" region="" universe="3" />
<hex_lattice id="5" n_rings="2">
        <pitch>1.0</pitch>
    <outer>3</outer>
    <center>0.0 0.0</center>
    <universes>
 1
1 1
 1
1 1
 1</universes>
    </hex_lattice>
<surface boundary="vacuum" coeffs="-3" id="1" name="left" type="x-plane" />
<surface boundary="vacuum" coeffs="3" id="2" name="right" type="x-plane" />
<surface boundary="vacuum" coeffs="-4" id="3" name="bottom" type="y-plane" />
<surface boundary="vacuum" coeffs="4" id="4" name="top" type="y-plane" />
<surface boundary="transmission" coeffs="0 0 0.4" id="5" type="z-cylinder" />
</geometry>
