s T1 and T4, and also
      the suggested reference routine T7.
    </p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
<li class="listitem">
          T1 was rejected if the result was too small compared to <code class="computeroutput"><span class="identifier">atan</span><span class="special">(</span><span class="identifier">a</span><span class="special">)</span></code>
          (ie cancellation),
        </li>
<li class="listitem">
          T4 was rejected if there w