// distance to subject
   if (!(strpos($key, 'SubjectDistance') === FALSE)) {
      $tokens = explode('/', $value);

      if (isset($tokens[1]))
      {
        if ($tokens[1] == 0)
        {
          return '∞';
        }
        else
        {
          $distance = $tokens[0]/$tokens[1];
        }
      }
      else
      {
        $distance = $value;
      }
      return $distance.' m';
   }