span> <span class="special">=</span> <span class="special">-</span><span class="number">2.</span><span class="special">;</span>
<span class="keyword">double</span> <span class="identifier">q</span> <span class="special">=</span> <span class="number">0.999</span><span class="special">;</span> <span class="comment">// = 1 - p; // complement of 0.001.</span>
<span class="identifier">sd</span> <span class="special">=</span> <span class="identifier">find_scale</span><span class="special">&lt;</span><span class="