a><span class="lineno">  223</span>&#160;  <span class="comment">// well approximates a normal random variable with the same variance,</span></div>
<div class="line"><a name="l00224"></a><span class="lineno">  224</span>&#160;  <span class="comment">// which is hwt.</span></div>
<div class="line"><a name="l00225"></a><span class="lineno">  225</span>&#160;  <span class="comment">// We then multiply the sqrt of the variance by scale to get</span></div>
<div class="line"><a name="l00226"></a><span class="line