ref="#Resources">Resources</a> below).
  </p>
    <h2>
      <a name="Resources">8. Resources</a>
    </h2>
    <ul>
      <li>
      The 'vwline' package is available on 
      <a href="https://github.com/pmur002/vwline">github</a>.
    </li>
      <li>
      The <a href="xspline.R">xspline.R</a> file contains R
      code for generating X-spline tangent functions,
      including the functions <code>xsplineFunGenerator</code> and
      <code>xsplineTangentExpr</code>.
    </li>
      <li>
      The source