<html>

  <head>

    <meta content="text/html; charset=UTF-8" http-equiv="Content-Type">

  </head>

  <body bgcolor="#FFFFFF" text="#000000">

    I cannot compile your new example at all, Rodolfo :<br>

    <br>

    <blockquote type="cite">! Undefined control sequence.

      <p style=" margin-top:0px; margin-bottom:0px; margin-left:0px;

        margin-right:0px; -qt-block-indent:0; text-indent:0px;">\@optionalusercs

        #1->\begingroup \def \extension </p>

    </blockquote>

    <pre wrap="">

** Phil.

</pre>

    <div class="moz-signature">-- <br>

      <img src="cid:part1.09040701.03000801@Rhul.Ac.Uk"><br>

      Philip Taylor</div>

  </body>

</html>