r storing meshes of quadrilaterals over a 2D region,
      and an associated data value which is constant over each quadrilateral element.
    </p>

    <p>
      <a href = "../../m_src/quad_surface_display/quad_surface_display.html">
      QUAD_SURFACE_DISPLAY</a>,
      a MATLAB program which
      reads files defining a 3D quadrilateral mesh surface and displays it
      within MATLAB.
    </p>

    <p>
      <a href = "../../m_src/stla_display/stla_display.html">
      STLA_DISPLAY</a>,
      a MATLAB p