10-node tet mesh.  The data lines begin with the node
      information from <i>nodes.txt</i>, followed by the coordinates of
      the new nodes.
    </p>

    <p>
      The output file <i>prefix_l2q_elements.txt</i> contains the tetrahedron
      information for the 10-node tet mesh.  There are exactly
      as many tetrahedrons as before, but now each tetrahedron uses 10 nodes.
      Each line of the file contains the indices of 10 nodes that form the
      tetrahedron, listed in a particular order.  The